How long until the riots start here, if ever?

News today tells of England suffering its third straight day of riots and looting and that it's spreading to other cities, now, too. This on top of other riots across Europe from Greece to Israel (over costs of living), and on. It's an odd thing, isn't it? It makes me wonder if we have that much in common with Europe or not. It makes me wonder how bad things have to get, how much joblessness, how little health care availability, how high the price of gas or food until the US begins such things, if ever. I wonder what it will take and then I hope, whatever that is, that we never get it, that we never get that bad, that low, that desperate. Link: http://www.alternet.org/newsandviews/article/647683/london_riot_turns_district_into_war_zone%3A_%26quot%3Bthe_system_is_cracking_and_it%27s_starting_to_show%26quot%3B