I’ve struggled with suicidal ideation my whole life, still voted yes. Just because you have a natural desire for something doesn’t mean indulging in that thing isn’t selfish. You can’t ignore the damage you do to those you love, and you are certainly not offing yourself for anyone’s benefit but your own. Just because an alcoholic craves a drink doesn’t mean it’s not selfish for them to hurt their loved ones for it. Gatekeeping depression is a weird maneuver.
As someone who also deals with suicidal ideation, you’re right. It is selfish, but because of society’s massive stigmatization of selfishness, when I initially read “selfish” I conflated that with “condemnable” in my mind. I agree with your point that people aren’t wholly selfish if they commit suicide, the act is, but I don’t think its selfishness makes it less understandable that people do it