My stand on nearly everything is that it's all relative. It is so in this case as well. Suicide can be a selfish act and it can be not. It depends on the person and on their situation.

I guess if you just end your life without even taking into account other people's feelings, then I'd probably consider it a selfish act.

But that's not how it usually happens. As far as I know people do consider their loved ones' feelings/needs, but they come to the conclusion that they won't care after all or even that they might be better off without them. That's the depression speaking and we all know how convincing it sounds.

Not sure if this was the answer you were looking for. But when I hear of someone who committed suicide my first thought is "Poor person, they must have suffered too much" and not "Pffft, what a selfish jerk".