There's a place I go to that hosts a few different raves, one of them being a psy night (which is the only one I go to) and the rest being other styles and I never ever came accross violence... then I decided to try out one of the others they hosted. In the queue waiting to get into the place there was a chav coked up to the eyeballs picking a fight with someone in the line, but he was that fucked that he couldn't figure out who it was so he just kept storming into the queue, being shoved/yanked away, then storming back again, lunging at someone else each time. The night just got progressively worse. I've found since that even though at psy raves everyone is totally screwed on whatever they can get their hands on, their tends to be something else other than the macho thing of 'boshing' ten pills at once or whatever. It's probably the same thing acting in both cases, the atmosphere, but I guess they're just very different to one another. Even when I have chatted and danced and been happy with the chavs that do frequent psy events they're just happy people the same as the rest. There is also far less of an obsession with the guys slapping the girls arses and whathaveyou... Just generally less testosterone perhaps? It's probably very much linked to irritating things like mdma being more popular and it's effect of making their penises shrink as well as just 'the vibe' though.