I'm not calling you a racist--I've read your other posts and know you're a smart thoughtful guy. But I would say this: picture yourself as a black man stuck at night in southie (the poor Irish area in Boston) walking down the street. You'd be in just as much danger. It's not the race, it's the poverty and ignorance. Poor white uneducated kids can be just as scary as the kids you saw. Any race can. It just so happens that in most inner cities the poor people are black. I've been threatened by both whites and blacks (I'm Asian). Truthfully, it's scarier getting threatened by the whites, because it's in the back of your head: if the cops come, will they take my side or the white kids' side? Not much of a question if you're being threatened by black kids.
What a sad thing, huh?
Wyst