CWL, from what I've read about the riots--all of 'em--I'd really, really doubt that many, if any, Swiss were involved. They--or their families--are making too much money off international trade to do that sort of protesting!
Eye contact and, "Do you
want to be first?" tends to have a salubrious effect on a crowd. I've seen it.
But I think I'd tend to go back and have another beer and then call my insurance company. (Realizing that some policies don't cover events such as riots, wars, etc.)