Not that they didn’t make one hell of a dent sometimes, mind you.
We’d more likely end up with an extra mutation or two, similar to the Moties [https://en.m.wikipedia.org/wiki/The_Mote_in_God's_Eye] and some solid species level PTSD from the whole mess.
Why do you think the doomsday prepper genes haven’t been bred out yet? I’m guessing because sometimes, they were the only ones left standing!
To do that would likely require liquifying the mantle entirely, or some similar scale event.
The last one was approximately 66 million years ago due to perhaps the Chicxulub impact, and it wiped out most of the dinosaurs - but modern birds are descended from them, and the crocodiles and alligators survived (well, VERY similar looking ancestors) /just fine.
None of them could build space stations, nuclear reactors, bunkers, etc. That we know of at least. None of them could grow hydroponic food, or communicate at near light speed to the other side of the planet, or even know what any of that means.
The entire span of time something vaguely resembling human has been around is also 1/10th of that time, but there have been MANY smaller events with large scale extinctions.
I'm not saying it would be a good time, but there is no way every single human is getting wiped out by anything except a nearby Gamma Ray burst/Supernova, surprise planetary collision, etc.
I said good luck exterminating humans.
Hell, not that long ago the most technologically advanced society of the time (Nazi Germany) with a massive and state of the art army tried to exterminate a subset of humans (Jews, Homosexuals, Roma) using massive force, the latest technology, and with a near single minded focus.
And while they did kill a lot of people and perpetrate terrible crimes, they also failed rather completely at the task. Even in areas where they were literally burning everything to the ground.
What makes you think they would have been more successful if they’d also been trying to kill themselves at the same time? Hence impeding their abilities?
And humans are, near as we can tell, the most lethal animals on the planet overall.
Humans survive implausibly terrible situations on the regular, and are currently living in every major ecological niche in the environment except perhaps the very deepest parts of the ocean. Though if we count military submersibles and oil rig diving bells, they too are ‘occupied’.
Would lots of people die, and would it be terrible if an environmental catastrophe occurred? You bet. But killing all humans is even less plausible than killing all ticks, or all roaches. Humans, the most lethal species on the planet, keeps trying and failing to do so.
Short of melting the mantle underneath us anyway. We do have some folks living in a space station. Probably not enough though.
And the moment anyone got wind of an attempt to try to do such a thing, enough humans would go to ground you’d never actually succeed. Hell, enough are probably already under ground for whatever reason you’d never succeed even if you did manage to catch the whole world by surprise and somehow actually release it all at scale.
The Nazi’s did not fail because they failed to try to kill humans at scale. Frankly, they did it at the largest scale since probably Ghenghis Khan. Certainly in a far more industrial fashion.
The issue is that it’s actually really hard to kill a lot of humans. Something that personally warms the cockles of my very human heart.
Embrace your ancestry of murderous (and loving) hominids, and aim to use it to make things better. Rejecting it is a false path.
Your comment made me notice that the motto was recently removed from the ZH Wikipedia page, so I just restored it - thanks.