Got any statistics?
That could be all of them in the whole world all gathered in one place, whiich would make them a vanishingly small percentage. Or that could be a tiny, tiny portion of the whole.
Do you have any statistics? I'm being inundated with argument by anecdote here. You and Rolfe seem to be the primary standard bearers and you're both so sure it's an issue, but you've both only come with 'feelings' anecdotes and stuff you 'know' without showing how you know it.
Nothing I have seen so far constitutes evidence of a problem beyond a teeny, tiny group of loud idiots. There are a subset of loud idiots in any group, it's the nature of people. You've not shown that it's in any way a problem.
Again, as with all idiot subsets, I would recommend dealing with and prosecuting the subset as and when it's called for. The massive, and as far as I can see, unjustified, brush that you and Rolfe are using - from a position of no statistical information at all, is freaking me out when I'm on a skeptics forum.