[rbg81]

I always thought that the real explanation is that “intelligence” are far more fragile than we expect and may have a very short shelf life. Eventually something happens to sabotage it. Like maybe nuclear war, pandemics, natural disasters (including asteroids), and out-of-control AI. It could also be something more mundane and ideological....Marxism? Or it could be that the race just becomes so nhilistic that it just degenerates into oblivion (e.g., Mouse Utopia).

[Getready]

Don’t forget mutating genome, stacking up heritable defects generation by generation, till an unholy combination of all of them yield a catastrophic failure of the host/offspring...or simply the continual loss of telomeres on the genome......on and on it goes...

Have a nice 😃 day.

[HangThemHigh]

I believe the same thing, that any intelligent race quickly figures out how to eradicate their enemies, then they get caught up in the destruction themselves.
Doesn’t bode well for us.