Then you weren't clinically depressed or suicidal. I appreciate that you made it through suffering and feel stronger now, but don't presume that that same definition of survival and strength applies to all people. Some people break. Even in the developed world, the suicide rate is high. I believe in the U.S. it is the #5 cause of death.
That's probably true, but the fact that you boil suicide down to darwinism shows that you don't know very much about the factors involved. We can talk about darwinism because the result is known; the kid is dead, and he is therefore removed from natural selection. I don't see how that's relevant to the factors that caused him to die, including incredibly cruel behaviour on the part of the others, lack of community support, or lack of societal acceptance of gays causing shame and ostracization (I know that's a big word for you, it means: being outcasted).
You wouldn't be here if your ancestors did not have communities to support them. The issue of suicide is not just chalked up to which individuals have what it takes to survive, but also who has a stable community of support. Any human being who is removed from human support for a long time slips into depression and health problems. Most hermits and isolationists are mental cases. Gays typically have a higher suicide rate than straight people because they lack societal acceptance, safe forums of expression, and they face hate and violence. Even living in the most liberal part of Canada, I am still subjected to homophobia.
No man is an island, and not all men breed... but that doesn't mean men aren't worthy of protection, respect, and compassion.