He isn't ferocious and fiery, he is calm and decisive.
We literally went into a bloodrage on turn 1, have 2 traits that give us stat boosts out of sheer rage and gave our entire faction a hatred of demons through passionate speeches.
Also:
When you learned what Orgrim had done, you wept, and you raged.
And just as before, you ensured that all knew of this. You took the secret shames and stories of the veterans and elders that they had kept close and you burned it into the souls and memories of the Mag'har. Through speech, through song, through rant, through letters and more.
...Yea. We're not calm, we're hot-blooded.
Personally think that repairing the damage done is more important and will have better long term affects.
Maybe.
But does Dranosh think that?
We can still destroy out enemies but we also can't let our hate for them overcome the fact that there are still injuries we must heal first.
The fire that forges rather than the fire that scorches.
We will never truck with demons, never forgive the shame, even if we have to burn at a lower pitch for a while we will still seek to end the Horde. To End the Legion.
It also strikes me as the more violent path.
It is.
What happens when Thrall's Horde comes around? Will we be so righteous and angry that we don't give them a chance? Will we strike them as soon as we hear the mere mention of the name?
This is fearmongering however.
We are not the only leader of the Mag'har(being more akin to the first amongst equals if even that). If our Rage causes us to act irrationally? I trust Garrosh/Jorin/Kaz to smack some sense into us(or Greatmother Geyah if she's still alive by then).
Or, as the unifier and chooser of the path of water, will we instead open ourselves to the possibilities that they have changed, speak with them guardedly and test them to be sure they are no threat?
Where in water do you see "Speak with them Guardedly"?
Do we open ourselves to the possibility that the Forsaken's Dreadlord is really a nice guy? That the Burning Legion can be redeemed? That the Bonechewers aren't cannibalistic monsters?
The Laughing Skulls have shown that we are already open to the possibility of people changing. Should we accept their continued use of Warlocks? Their proclaiming the Monsters of the Shame to be Heroes? No.
Like fire, we will burn away such misconceptions. Let them hear our passion and know that we speak truth.
Let these "heroes" of the New Horde respond to that.
If they acknowledge it? We trigger a reform in the Horde to be more akin to ourselves.
If they remain unapologetic however? We will know that they have not changed(and should not be accepted).
Repairing the damage could also mean better relations with the Draenei and the Alliance as well.
Water seeks forgiveness. The approval of others.
Fire seeks the acknowledgement that what the Horde did was Wrong.
In this, Water means better relations with the New Horde. The "We're totally good guys now and should be forgiven" New Horde.
Fire means better relations with the Draenei and Alliance. The "Those guys were horrible monsters that murdered us for no good reason." Alliance and Draenei.