Why Asians aren’t rioting — yet

The looting and violence that spread across Britain last week undoubtedly had many causes. David Cameron, the prime minister, tried to explain it away as an outburst of criminality, while his critics have blamed it on everything from rising inequality to incompetent policing and even summer boredom.

It was probably all of those things and more. The trouble started in north London when police shot and killed a suspected drug dealer during an arrest, which eventually led to an outbreak of looting and vandalism after residents in one of the poorest parts of London took to the streets to express their outrage. Copycats in other parts of London and elsewhere...