I don't think you are understanding me correctly. Maybe you understand mob mentality differently to I.

http://en.wikipedia.org/wiki/Mob_mentality

Watch the video of this riot ( http://v.youku.com/v_show/id_XNDUzOTYzMzQ0.html ) and tell me that it isn't clear signs of mob mentality. The pictures of the damage look bad but when you see the video it looks like a social gathering with people laughing (e.g. ~0:35) and nothing really going on, other than a handful of hooligans causing damage.