The hardcore "dancing" is reason Number 1 why I really don't go out to shows anymore. Most of the extreme bands I like nowadays get lumped into a tour package with a "core" band of some type which attracts the "scene". It formula NEVER fails of your standard metalheads either headbanging or doing the old school style of push pit, then it gets interrupted by "ninga gaiden", who in turn pisses off said metal heads and small scuffles break out. Personally, I"m from the old school of the "all together push-pull in motion", or "circle pit", and those have always had the unspoken rule of looking out for people around you and picking up people when they fall. It was just how it went. Nobody questioned it and you looked out for the other guy. I can recall countless times where a "dance" just went swinging arms and kicks without even caring who they hit. Hell, I even had a friend once who was AWAY from the pit, and some kid got the Holy Ghost of Ryden and started swinging arms and hit her in the eye. I know people say, "If your in the pit, then its your fault", but most of the time its the "dances" taking it to people around them. Basically, I just see these people as scene douchbags who want to look cool doing their "dance" and waring their tight jeans. Actually, it makes me cringe at any kind of "core" music even more. I'm all for self expression if its music you like, but please, respect people around you, and don't back up your hitting someone in the face with, "I was just having a good time."
Not to mention the dude that was gaffa-taped to a chair, that was incredible! 
Mainly the pit culture is pretty healthy here, whether it's a mainstream metal group or a small local hardcore band playing. I haven't seen that many troublemakers or idiots besides the few occasional drunken morons who dive into a pit for the first time, get pushed once or twice and take it as a personal war declaration. Gladly those everyday heroes get collectively disposed of from the pit in no time.
