Why do you assume the attackers are straight?
Queers fight each other all the time. Ask any bouncer who has worked gay bars. Faggots are mentally unstable and prone to violence.
Gays are prone to violence? Really?
I wouldn't presume so. I suspect many straight men are jealous of gay men because gay guys tend to have better relationships with women.
I think, offhandedly, that
compared to straight folks, gay folks, particularly gay men, get lots of "strange" -- call me crazy, but I think men, period, regardless of their sexual orientation, like "strange" -- and that's just not something that happens one is more frequently getting into fights.
Just looking at the charts above, it seems clear to me that the likelihood of getting some "strange" has everything to do with whether there's a woman involved. That suggests that gay men have to be somewhat more civil toward one another in order to increase their prospects of obtaining a "conquest." That "slap 'em and then they swoon for you" thing only works with women in old movies.