I guess one's conclusion depends on one's perspective. If one believes that life here-and-now is mostly about self in the here-and-now then they might go your way, but if one believes that life here-and-now is more about God and hereafter than it is self and here-and-now then a different conclusion can be reached.
Have you ever read the Gospel of John?
Intense personal suffering & quality of life vs taking one's life is a tough issue especially if you're the one suffering. I've been close to people who were suffering and debated with themselves whether to do it or not. But I hope if I'm in the situation that I can stay focused on keeping my life about living to serve Christ, even to a hard end.
The thing that I have a real problem with is people saying that these people will not be forgiven for killing themselves.
That is sad and cruel.