The fool adults that let things get this far aren't the only problem here. More attention needs to be brought to teaching kids that bullying isn't acceptable. The self-esteem issues extend in that direction as well; people who feel good about themselves don't treat others this way. We spend so much time reacting to the symptoms of a troubled person that barely any effort is made to fix the damn problem itself. More children need to be informed that making others feel horrible about themselves is not a habit to grow up perfecting; the people who behave this way should be the ones corrected by their peers and the adults around them, period, and if they can't figure that out on their own (because really, what do parents do to make it obvious to them?). They need to be told, plainly and simply, by parents and teachers alike, what they're doing when they treat other people like this, and they need to be punished when they misstep.
Whatever other mistakes the school district made, they didn't force these kids to treat each other like this. We foster this sort of environment when we don't teach our kids some damned empathy. Lack of gay sympathy or awareness isn't ultimately what caused the suicides; fear, humiliation, torment, and pain did. Sexual orientation was merely the vehicle in this particular case.