>>Sounds like the perfect excuse for selfishness. If your life is all there is then why worry about anyone else?<<

Selfishness isn't all bad. Consider that selfish genes are responsible for altruism.

Why worry about anyone else? Well, those selfish genes make us care about our kin who share the same genes.

You know what they say "born once die twice" (your words) "born twice die once".

I have no idea make you are getting at here.