No one mention something yet: kids and teens (hereafter, simply "kids") live with their PARENTS.
Other than bullies, parents are the most common reason why these people commit suicide. Parents have their own dumb ideas of what their kid should be like, and they try to force them into the kid. On top of that, they withhold their love, emotionally abuse the kid, and/or inflict punishment on him/her for failing to live up to those ideas. Sooner or later, the kid decides that it's less hassle to just CTB than to constantly struggle to live up to the impossibly difficult ideas.
These things would be a nonissue 100+ years ago, when kids who were being abused could simply run away. They could hitch a ride on a freight train, get to a big city where they could hide in a crowd, find a job in a warehouse somewhere, and start a new challenging but abuse-free life. The parents would be out of luck. Today, however, an army of police detectives would bring the kid back home, continuing the abuse cycle, until the kid grows up and moves out, or CTB's.
That's why when I hear about parents losing their kid to The Bus, I feel no sympathy for them at all.