Moshing is one thing, but what you guys are describing is Slam Dancing, or at least the modern version of it. Not a fan of it myself.
Slam dancing I could deal with, no problem, if you mean the punk-style slamming into each other... hell, at Sevendust shows I've been in the middle of it, knocked down and picked up, knocked others down and picked them up... you come away sore, like a good workout, maybe accidents happen, but it's all in good fun. This crap was wild flailing of fists and booted feet, with the obvious intention of taking up as much space as possible... then moving that into where people are. Pointless, as far as I could tell, except to hurt someone.
Anyway, sorry for the derail... I may not go back to the venue, but the show (and the guys) were phenomenal!