Sometimes it is a particular neighborhood that never recovers, and sometimes it is a whole city. Detroit is a classic example. It had the worst riot of the 1960s, with 43 deaths — 33 of them black people. Businesses left Detroit, taking with them jobs and taxes that were very much needed to keep the city viable. Middle class people — both black and white — also fled.

Harlem was one of many ghettos across the country that have still not recovered from the riots of the 1960s. In later years, a niece of mine, who had grown up in the same Harlem tenement where I grew up years earlier, bitterly complained about how few stores and other businesses there were in the neighborhood.

There were plenty of stores in that same neighborhood when I was growing up, as well as a dentist, a pharmacist, and an optician, all less than a block away. But that was before the neighborhood was swept by riots.

Who benefits from the Ferguson riots? The biggest beneficiaries are politicians and racial demagogues.