I edited my post a little, you may want to re-read it.
I'm speaking on entirely 100% selfish ground. I explain it this way because when someone commits suicide they are being entirely selfish. In my explanation I am giving that to them... fine, you're gonna be that way. It's still a mistake for you, and the only reason someone would come to a different conclusion is because they are too scared to be totally honest with themselves and think through the decision fully before doing it. They don't want to think through it fully because they know they will not be able to do it were they to be completely honest about it, and in that moment where they want to end it all, they don't want to be prevented from doing so, so they don't even allow themselves to prevent it.
They want the decision to remain easy to make, because at that moment that is what they want. They want to be able to push the button and get what they want. Why make it more complicated by being totally honest and thinking it through, especially when doing so will most definitely convince you otherwise? That's not what they want in that moment!
So, this is why it is a mistake, a fallacy, for people to commit suicide... I know it's difficult to follow but please try. People who commit suicide have not thought it through with honest totality, else they wouldnt, therefore they are purposefully limiting themselves from doing so in order to make that decision, assuming once it's done it's done and the question itself ceases to exist. Forget about how it's going to effect everyone else, you're erasing yourself that's the least of your worries, right? The reason it is STILL a mistake is because this is making a with objectively permanent decision based on subjective temporary reasoning and/or feelings.
The reason there is no evidence because that is the only way one can fully consider such a decision before making it. and even if you're fully convinced you want to commit suicide, you must fully consider it before doing it because every other decision has temporary effects, no matter how bad they are. Dying, on the other hand, always permanent, always total, objectively so, with not a single subjective positive effect because you're not even existent to experience one.
You forget the important part: that they are nothing. Nothing has no regrets.
No, in fact, that is the very reason people commit suicide and I'm well aware of that. My point is, you cannot make this decision on the basis of what your non-existent self doesn't experience because you don't know what that is, and if you actually go there you cannot change your mind. Therefore, that leaves your existent self to decide which is better, and if your existent self is totally honest, it will never choose suicide.
This comparison is difficult to make because how can you conceive nothing? But regardless, it's simple cost/benefit analysis, and it is simply impossible for nothing to be the best decision. Therefore, it is the absolute worst. Contrary to mass belief, the suicide is not problematic from a philosophical viewpoint. I know this because I started with the exact opposite viewpoint and still ended up with this determination: to the fullest extent nothing can be conceived (or rather, total lack of conception) there is absolutely no benefit from it, leaving everything else as a better outcome and choosing nothing over anything to be the worst decision possible. This determination is made from an entirely, 100% selfish point of view where the only consciousness is the bare minimum thought required to reason out the decision. If you don't believe me, consider the proclivity of the nature of the universe and the fact that not a single animal (aside from humans, if you consider humans animals or equal to them) commits suicide.