I know what you mean. Why would it be so bad to enlighten kids to the fact that gay people exist. You know the entire writing staff of one episode of Adventure Time got fired after the episode "what was missing" apparently insinuated that two characters had a gay relationship.
It's not even that heavily implied frankly I think it's weird that in kids show a character can be killed, horrifically injured, psychologically tortured but if they're queer and here then the execs and parents can't get used to it.