But not all of them. And the ones that survive have the opportunity to learn from the ones that didn't.
That's less different from Earth than you may think. We've witnessed entire countries collapsing even in the last few years. If it wasn't for Earth providing free air, reasonably cheap water, and not-that-difficult food even when your local political system collapses, nobody on Earth would even consider switching their country to run on Communism; rather than merely killing dozens of millions of people it would be witnessed as bringing total extinction to anyone who tried it.
But not all of them. And the ones that survive have the opportunity to learn from the ones that didn't.
That's less different from Earth than you may think. We've witnessed entire countries collapsing even in the last few years. If it wasn't for Earth providing free air, reasonably cheap water, and not-that-difficult food even when your local political system collapses, nobody on Earth would even consider switching their country to run on Communism; rather than merely killing dozens of millions of people it would be witnessed as bringing total extinction to anyone who tried it.
Basically, evolution doesn't stop.