Suicide is indeed one of the most selfish acts a person can perform.
That is the most inconsiderate, narrow-minded, ridiculous claim ....
That's pretty ironic because your closed mindedness doesn't take into the account of all those who witness the aftermath that the act of self-destruction of suicides brings up. The people who pick up the literal pieces are the collateral damage if you will.
Unless you have a several million dollar insurance policy that allows for a suicide clause and it's going to bring several people of extreme poverty and desolation. That's the one of the rare ways anyone can benefit from a person's suicide which in any way make the act of suicide selfless.
Even if you don't have any friends and family, do you even consider how much untold emotional and mental damage occurs to even the strangers who find your body and have to clean up after you? Sure, they don't know who you are and they don't have an emotional connection with you but unless they're extremely autistic and disconnected from their environment, they'll be subtly and irrevocably effected and emotionally scarred from the experience. Those strangers (police, EMT, fire fighters, etc...) are likely in the business of finding suicides on a limited yet more frequent those members of the mainstream public. The more suicides they find, the more scarring and emotional damage they'll buildup.
Then in theory, you might childishly counter that they deserve that pain and anguish and emotional scarring because I'm suffering, blah, blah, blah... yada yada. That the whole world even deserves to suffer like you do.
Then I would counter that if you are actually wishing that kind of emotional pain, suffering, and anguish on anyone simply because you are having a difficult time (suffering mentally, emotionally, etc...) then you are a vindictive monster. And that's basically the only proof I need to prove that suicide is selfish.
We can go on stupid tangents about honorable suicides such as several people are stuck in a mine, one person is severely injured and there isn't enough air, water, and food for everyone to survive long enough for rescue. That might be slightly less selfish reason (or even one degree above being completely selfless) for suicide but it too has its consequences for the surviving members. But that likely isn't the case in 99% of suicide cases ... so that kind of suicide is mostly moot.