He was a prick who slaughtered an entire longhouse, and many other warriors besides. He refused to stop when the Big Man told him to stop, and gained ascendance only because he happened to be a Fang. While being a Fang afford you many privileges, the right to slaughter an entire longhouse of people is not one of them.
Except that is not what happened. That is only one side of the story which you are portraying, while also leaving out key details.
Where Priit had taken it further, however, was decrying his former paramour as a thief. She had received part of his ration as his wife and mother of his child, traded on his growing reputation, and ingratiated herself into his extended family. All of that was unjust and she continued it even after the child was born and she knew it was not Priit's son. (How the woman was supposed to know that, Aeva did not know, but both of the other two Big Men agreed with Priit's assertation of lack of paternity. No matter how grudging it was from the Big Man of the Fingers.)
From there, the situation became murky. Priit claimed that he went before the woman's longhouse, demanding that she and the representatives present themselves and go before the Big Man to resolve his claim of food theft. Of all crimes, food theft was nearly the most serious; something that was potentially worthy of death. At that point, many of the men of the longhouse attacked him, likely to cover their complicity in food theft.
The survivors from the longhouse claimed that Priit simply attacked them from nowhere. They were only defending themselves.
What was not in dispute was the fact that Priit single-handedly savaged everyone who opposed him. More than two dozen men. Priit smashed everyone that opposed him aside and the wolves following on his heels laid low everyone who managed to bypass his spearpoint. When the last of his opponents was put down, he took his 'wife' and 'child' to go before the Big Man of the Fingers. The initial fight wasn't exactly quiet and quickly drew spectators. That escalated the situation and turned it into a general riot.
It wasn't until the Big Man came with warriors to crack heads together that the fighting actually stopped. From what Aeva had heard, the Big Man had nearly smashed Priit's skull on the spot for disturbing the peace. Many were injured and some were dead, his kith and kin among them. The only thing that had stopped him was the Fangs closely circling around one of their own. Nothing had been said, but the Big Man realized that acting without consulting the other Big Men would end... poorly.
Firstly, when we look to the facts of what had happened in that case. If you look at the excerpt above, both of the other Big Men, even the one from the Fingers, agreed that Priit was right in his assertion that there was a lack of paternity here. Meaning that the woman was stealing food from him in all senses of the word, and that she did so knowingly. Considering how important food was in this era, he was right to assert himself by the laws of the People.
Secondly, the story about his slaughter of the longhouse is in dispute. While it is not in dispute that he killed members of the woman's longhouse, what is in dispute is the story behind it. I find it hard to rail against his character when now that we know more about him, his story seems more likely than that of his accusers. If he truly did not care for justice then why would he still try to present the woman and child to the Big Man of the Fingers for trial when he could've easily exacted his own justice instead? If he did not care for the laws of the People and is as privileged as you are making him appear to be, then why did he not simply leave when levied with such heavy fines? He could've easily shirked his duties, not starved, and went elsewhere. Instead he came back to save the People from the Northlands when for all intents and purposes I would not have faulted him for leaving at his treatment. If we take everything into account concerning the facts of the trial, then yes he was right in what he did. While the outcome of it was horrible, his reasoning using our own laws at the time were not. With both Big Men believing the paternity of the child was in dispute, his own action showing that he did show mercy to the previous husband of his divorced wife, and now his character seen through more actions, I believe he really did try to get justice in his own way.
Unlike what people are saying, I don't think he simply walked into the longhouse and slaughtered them all for no reason. If even the Big Man of the Fingers acknowledged that the paternity was in dispute, than what does that say about his case? Also, you said that he did not stop when the Big Man of the Fingers told him to. In this first case, he actually did!
By taking the other side of the story, your bias against him here is clear.
He was right to take the actions he did the second time against the Big Man of the Fingers as you will see below he had no other recourse.
I agree that six lifetimes of food was too much of a fine. In fairness, it was still far less than what the other options we had to vote on were (i.e. execution, exile) and we couldn't have known it would be harsher than the treatment that the Debtors get. But how was he acting in self defense when the Big Man only ordered his arrest after he attempted to take power? And for the personal grudge I wasn't referring to how he killed the Big Man but how he is threatening Aeva's position just because she ruled against him. This can lead to civil war.
Except the option for the fines was said to have been Excessive it was even italicized for emphasis. When the option is put in contrast by other extreme examples like death and exile, we should've known that it would've been excessive in comparison, as he was literally fighting while starving himself in defense of the People against the Northlands. It's rather hard to pillory him here when for all intents and purposes he could've simply decided to leave the People to their fate against the Ivory Blooded Chief rather than continue to pay off his debt even if it was likely easier to leave and use his skills elsewhere so that he wasn't starving.
Perhaps that was how Priit saved them. The boy had been brutally mistreated in the estimation of most warriors. He had done his duty, only for the Big Men to savage him from on high. Even the punishment; six lifetimes worth of food, one for everyone who had died in the riot he'd spawned, was deeply unusual. The punishment was too much, many thought, an abuse of the Big Man's power. A criminal Debtor would not have been given such a step price for their freedom. Even if some of the People thought Priit was punished correctly, how was he to be treated. Was he a Debtor? Was he otherwise a normal member of the People?
The Big Man of the Fingers took the latter finding since it allowed him to punish Priit further. After all, under the precedent set by the Three Big Men, a warrior could be fined for harming the People in the course of his duties. Priit, by focusing on paying off his fine through hunting, was obviously negligent in aiding the war effort. If he had focused on the war effort... well it held to reason that the boy was being negligent by failing to pay his fines.
That hypocrisy was obvious to Aeva, but she could she do? Contradict the laws and punishments that she handed down? It was an obvious problem brewing, but Aeva ended up being unable to respond to it.
Looking at this excerpt from the update specifically, it is hard to say Priit was not justified when the Big Man of the Fingers really was out to get him.
Six Lifetimes worth of food he had to pay, something seen as deeply unusual when even criminals would not have to pay the same price for their freedom. His legal status put in limbo.
Then there is the fact that the Big Man of the Fingers kept trying to hammer him with this finding. If he tried to pay off his fine that we levied on him, he would've been seen as negligent to his duty as a warrior in aiding the war effort. If he had focused on the war effort, he would've been seen as negligent in failing to pay his fines. Damned if you do, damned if you don't.
No one can say in any similar instance that he was not justified in his anger when he was essentially put in an unwinnable situation due to the grudge harbored by the Big Man of the Fingers who really did have it out for him. Under the precedent WE set, what other recourse did he have? We gave the Big Man extreme powers, and with a Big Man who hated him as much as this, what choice did he have aside from trying to take power. Aeva herself even saw it as the travesty it was.
So yes, this was self-defense if we take in all the facts and actually look at things through his lens rather than just labeling him a trouble maker for not agreeing with some of our views and disbelieving him at every turn. It is at this point clear that the Big Man of the Fingers was going to likely have him punished or killed for his actions due to the enmity against him. Legally Priit had not other recourse. Should Priit have just laid down and died, as that was would've happened if he was taken prisoner? Under the laws of the People and the precedent set, what other recourse did he have?
As for his grudge against Aeva. If we take a look at things through his view, sure he is upsetting the balance and the peace through pursuing his grudge against her, except legally speaking he is correct. By our own laws, something we acknowledged could later be a problem. Aeva is not an adult. While his choice can lead to civil war. It is also arguably true that some of the voters last turn bear some responsibility, and Aeva in this case as their avatar does, for jeopardizing the war effort and potentially fracturing the People.
He was done a great injustice, so I can see where he is coming from in pursuing his grudge against others. Especially as this combination with Blood Brothers made this inevitable.
Its fine, He is fine. We will survive this and become stronger for it. Remember, eventually he will die and we can pick up the pieces.
Pieces we caused to be shattered in the first place in what is now clearly a rather arbitrary decision, that does not seem at all like justice.