in the end, suicide is dumb because it's irreversible.
the fact that it's selfish has little to do with how illogical the act is.
you simply have no opportunity to change your mind or work on improving your situation. and things could always be worse no matter how dark your situation feels in the moment. very few people on Earth are truly so destitute and without hope that suicide makes sense. for 99% of people that kill themselves, it was pretty much unnecessary.
people have overcome such horrific, terrible experiences in this world. things that most of us could never imagine going through. the human mind, body, and spirit are remarkably resilient. there's usually no excuse for killing yourself. someone has always been through worse than you and come out just fine. so I can see why terminally ill patients want the ability to end their life on their own terms. I can see why someone who has been captured/imprisoned/tortured with no way out would see death as a viable escape. but short of that, I really have yet to hear any good reason for suicide from the average depressed 20-year old.
it's mostly BS.