I understand the implications of this question, but why do we prioritize self-preservation over all else? Like, I get that's a biological instinct, but at some

I understand the implications of this question, but why do we prioritize self-preservation over all else? Like, I get that's a biological instinct, but at some point it has to be not worth it to save ourselves. If we're making value judgments for everything else, it's simply wrong to ignore ourselves.