Regarding the first sentence in the quote: Nobody knows for sure how big Chinese and North Korean prisons are. Though, it is not much of an excuse to point out that these two countries are worse than the United States of America.
America has more than 2 million citizens behind bars, the highest absolute and per capita rate of incarceration in the world. Black Americans, a mere 13 percent of the population, constitute half of this country's prisoners. A tenth of all black men between ages 20 and 35 are in jail or prison; blacks are incarcerated at over eight times the white rate. The effect on black communities is catastrophic: One in three male African-Americans in their 30s now has a prison record, as do nearly two-thirds of all black male high school dropouts. (...)
Black relationships and families fail at high rates because women increasingly refuse to put up with this abuse [in relationships]. The resulting absence of fathers - some 70 percent of black babies are born to single mothers - is undoubtedly a major cause of youth delinquency.
Orlando Patterson, professor of sociology at Harvard, writes in International Herald Tribune: