Well, you forgot that their other choices consisted of attempting to repair their ships (and be killed by the wildlife), commit mass suicide, or set up a pure militarized colony (only possible if they had military personnel in the first place). So they decided memetic 1980's action movies would be the Blackstone Midget Subway basis of their society.
Decided no. Needed to yes.
As for how that's possible...auto corrupt is weird.
He's also said that the presence of sapients are part of what constitutes "more dangerous", thereby implying that if you discount the presence of certain sapients (which you can theoretically effectively do by forming non-aggression pacts with them), there would be even safer areas on Avernus.
Not quite sure how that works. My recollection was that he stated that there are significantly more dangerous regions outside of where we are on Avernus, we're just in the safer regions. There are more sapient in other regions, and we maybe able to create non aggression treaties with them.
Others we may not, like those termites you created.
@Durin
1. Since you're here, did you say that the existence of significantly more dangerous zones was contingent on the aggression of the other sapients?
These are functional ways of doing so. A Weapon decides it wants to eat us and then we have to fight Prototype and the Blacklight virus, or the Lizardmen expies decide we're not part of the PLAN and wage the occasional war on us, or maybe some idiots decide to worship a Deep One and then it discovers it likes being worshipped.
Some additional ideas include one of the Peoples' versions of Nagash waking up, or two exceptionally advanced Peoples go to war and unleash psychic WMDs that affect even us despite us being so far away, or we get hit by some crazy psychic plague that targets psykers and we have to go into crisis mode to deal with both it and its effects.
1. A weapon already decides it wants to eat us every few decades we just can't do **** about it. Its kilometres underwater somewhere, and we have no idea where that is and its an alpha plus (albeit a weak one, but weak alpha plus is still fold space like a pretzel strong.)
2. Those are not diseases those are end game crises. Your idea of what a constitutes a reasonable disease is weird even Nurgle can't pull that kinda crap on a regular basis. I'm not saying I don't think Avernus doesn't have those somewhere, but it just doesn't seem like the kinda thing that would be wondering around infecting things at random, especially in the highly regulated Avernus. Maybe the PM uses it to clean a region that's failed, just dumps the Blacklight equivalent, dissolves everything into biomass for reuse.
3. If the Lizardmen decide we're not part of the PLAN then that's the World Mind's job to get em doing that. Though how they'd cross the sea in large enough numbers to be a threat...eh maybe they've got a dino for that. I doubt it though which I will elaborate on in a sec.
4. Pretty sure we kill idiots like that waaaay before they become an issue, though I somehow doubt a deep one would give a crap.
5/6. This also relates back to four. On the Nagash point its entirely possible that that is happening right now, but we'd never know, similar to the two races going to war, because from what little info we have the Planet Mind doesn't like things from one region messing with other regions. Think of each region like a laboratory, we know that the Everglades laboratory has something that should destroy all of Avernus (the Life eater fungus), but while we can remove it from the everglades and use it elsewhere, it will never grow anywhere, but the Everglades. My point is that more than likely the biggest chance of having something from another region affect another in a major way (thus changing whatever experiment are in there) is only if the Planet Mind allows it.
7. The last one's a pretty good, event I don't want it to happen, but I wouldn't mind getting a hold of that disease for study.
However, these are all events on a lesser, but similarish scale to the Daemonic incursion, so what I think you're really asking is why are not getting more events like that? Cause none of these are related to the wildlife, not really.
I am not making that mistake. It's still just statistics. At the end of the day, we keep a certain amount of troops at home to deal with attrition, not crises. Theoretically there are things on Avernus that can wipe out Avernite humanity or damage it so severely we have to spend several turns rebuilding, but in practice, only off-world things like Orks and Chaos act in such a capacity. EDIT: Also rogue psykers I guess, but you can lump that in with Chaos.
So?
How do I put this...we're not important on Avernus. Like at all.
Just because there
are things that can wreak our face, doesn't mean that they can and will. I very much doubt we're even a major project for the World Mind, if we were we'd likely be experiencing a lot more crap thrown at us.
Also fundamentally there seems to be a difference in how we enjoy these things. When I hear that we've lost nearly 10 million men in pitched battle with a thundabeast herd and then even more to the next 12 herds, I personally start filling out the blanks, but you...I dunno, would you have preferred to have commanded the engagement that lost them?