Historically gay murders go under reported as well as violence against gays. There are many reasons. You might be outcast from your family .. that is the shame and stigma that is put on gays prevents families from talking sometimes, and also sometimes gays don't want to be exposed even more so that family, friends, works don't find out. And sometimes law enforcement might be a little indifferent (this was certainly the case in the past).
And of course even prior to the stonewall riots, a lot of the GAY people that ultimately revolted were poor and forced out on the streets .. some cross dressers, some were prostitutes just to make a living, and some were just your everyday closeted guys. All that meant also that these people were extremely vulnerable both to gay bashers and the police who were just as bad.
Even the animosity towards "femm" guys among gays I am sure makes any support network difficult. It would be nice in the gay community, especially if there were more compassion, to realize that every life is significant and we share things in common even with people that SEEM to be different on the outside.