If it’s an existential risk, it kills everyone, selfishness suffices just fine.
A selfish person protecting against existential risk builds a bunker and stocks it with sixty years of foodstuffs. That doesn’t exactly help much.
For what existential risks is this actually an effective strategy?
A global pandemic that kills everyone?
The quality of life in a bunker is really damn low. Not to mention that you presumably won’t survive this particular risk in a bunker.
A selfish person protecting against existential risk builds a bunker and stocks it with sixty years of foodstuffs. That doesn’t exactly help much.
For what existential risks is this actually an effective strategy?
A global pandemic that kills everyone?
The quality of life in a bunker is really damn low. Not to mention that you presumably won’t survive this particular risk in a bunker.