When they begin to lose their sense of "self", they think life's not worth living anymore.
One way for people to stop killing themselves, is to get their minds off their own faults and problems, and look to Christ. As someone who's screwed up enough to mess up a lot of lives, you just have to learn to plug on, ask forgiveness when you mess up, accept forgiveness when you're asked to, and accept that life is precious and given to us by God.
My wife gets angry with me at this opinion, but I truly believe that Suicide is the most Selfish and Cowardly way to get out of your problems. I understand when there's serious mental illness that consumes and destroys some. Also, I accept soldiers or agents who kill themselves to prevent having information tortured out of them. However, most suicides I've seen have been permanent solutions to temporary problems.
Some excuse Anthony Bourdain's suicide. I don't. He left behind an 11 year old daughter who's going to desperately need her "daddy" in the upcoming years. And, if you believe in a just, righteous God, you understand Bourdain's problems are NOT over, but just beginning.
You seem to be confusing us with some other generation.