It's the person's choice to choose to end their own lives. Selfish, in that their pain isn't eliminated, it's merely passed on to those around them who will grieve their passing, but ultimately... If a person, after an extended duration of time (that is, more than a simple emotional outburst) cannot deal with life and wishes to end their own life, especially in cases with the highly disabled or the elderly... Then it is equally selfish to tell those people that they are not allowed to end their own lives because it might hurt you.

EDIT

As for those bringing in "you're ruining God's plans" into the mix: God, if you believe he exists, is [b]omnipotent and omniscient[/b]. He planned for suicide. If he didn't, he's not omniscient, or omnipotent. :lol