"Social exclusion" is a real problem, but it doesn't excuse the looting and lawlessness on the streets of London.

LONDON—Since moving to London more than a year ago, I've seen a woman toss a cat into a "wheelie bin" for no particular reason; a group called the Socialist Workers Party march on the Royal Bank of Scotland, which is 84 percent publicly owned; and a man hurl a shaving-cream pie at a fallen news mogul in the seat of government.