[quote=@catchamber]
If someone absolutely wants to die, and someone else wants to make a buck off giving others that absolutely want to die a way out of life, let them. Populations will most likely gradually lose their predispositions towards suicidal behavior, due to evolution. Productivity lost due to failed suicide attempts, and the costs of subsequent treatment and welfare program usage, will also decline. That's good for society as a whole.

As for the philosophical aspects of the debate, I'll say that I think every action and nonaction is selfish, including altruism, as you're imposing your will onto reality. Being selfish is okay, so long as you don't harm others. People have also been playing god ever since they domesticated other creatures, so I find "don't do X because [religion]" arguments amusing.
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I broadly agree, although most people who go for PA suicide in countries were it is legal are terminal cancer patients who have well past the reproductive age so the effect on the genepool is uncertain.