Earlier quoted context omitted.
Eh, a bit overstated. None of them killed EVERYTHING, near as we can tell. Not even the oxygen catastrophe you're mentioning. To do that would likely require liquifying the mantle entirely, or some similar scale event. The last big 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 al…
Species become extinct all the time. Humans don't have to exterminate all life, to exterminate humans.
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.