Who taught that 14 year old kid that gay men (trans women?? "feminine-acting" men) are expendible? Who put it in his head that they should be slaughtered?
Whoever did so not only contributed to the murder of the 15 year old, but ruined that 14 year old child's entire life. What that kid has to deal with now, having done that!!
We need to draw parallels between the things we are teaching our children and tragedies like these. Kids listen to what society teaches them growing up and that informs their choices.