The explanation is new, too: instead of the traditional link between poverty and crime, this crime wave has more to do with policy. Virtually all the cities with the most notable crime outbreaks — San Francisco, Seattle, Portland and Los Angeles — are places with progressive prosecutors working to limit punishments for looters, organised thieves and the unruly, occasionally violent, homeless. The cities, with the exception of Los Angeles, are also among the whitest in the U.S., with a large population of educated people.

The lax legal environment has made west coast cities the happy hunting ground for “smash and grab” thieves on a hitherto unprecedented scale. These cities have also seen rapid growth in violent crime, which is never far behind disorder on the streets. Once these places, notably Portland, were seen as urban exemplars, but few would choose a city whose downtown has collapsed under months of pressure from radical demonstrators and suffers from record homicides.