There was a theory that starting in the 90s or so, a massive crime wave would hit the US. 80s movies like RoboCop and Escape from New York were possibly based on this idea that an increasing crime rate was just going to keep climbing. But, as it happened, the overall crime rate began to decline starting around 1990.
A theory for this happening is that the legality of abortion, being utilized principally by poor women, made the next generation of criminals simply never be born.
I would, however, note these two graphs:
http://ag.ca.gov/cjsc/glance/graphics/13incarAJ.gif
http://www.visualstatistics.net/East-West/Incarceration/Inset.jpg (lists whole numbers rather than per capita)
The total number of criminals in jail began climbing previous to the 80s and climbed at an impressive rate up until ~1990. The total number of people currently incarcerated in the US is unprecedented in the world. Personally, I suspect that this probably due to the prevalence of three strikes laws (introduced during the 90s).
While it’s plausible that abortion may have halted some number of probable criminals from being born, it’s quite likely that those who were committed their crimes and subsequently got locked up forever, before being able to complete their personal total possible output of criminal behavior.
Just to point out that we’re not kidding with ourselves, it’s worth noting that we are talking principally about poor, younger black men. While there is certainly no genetic link between race and criminality, there almost certainly are shared social experiences or family-trained behavior that can make a child more likely to become a criminal. Poor starving Mexicans pack in twenty to a room and work their butts off where poor black Americans figure that they have no future via gainful employment and so turn to crime. Poverty is, certainly, a large predictor of crime, but unfortunately race is as well.
There are 221.3 million whites, 44.3 million Hispanic or Latino, and 40.9 black or African-American people in the US. 8.2% of whites are living in poverty (18.1 million), 21.5% of Hispanics (9.5 million), and 24.5% of blacks (10 million). From this, you would expect that incarceration rates would be roughly equal between blacks and hispanics, with whites being 1.8X more prevalent than either of these two groups. In truth, blacks have a slightly higher rate of incarceration than whites (perhaps 1.1X) and a significantly greater rate than hispanics–nearly triple. I could see some argument that police prefer to pursue blacks than whites, but I wouldn’t imagine they would avoid Latinos. So like I said, it is probable that the shared condition of being a poor black person in the US and the sort of parent-to-child conditioning leads to higher crime among this area of society.
Now, assuming that no one has any particular qualms with what I have said, the main question I would like to ask is whether it could be that the massive, long-term incarceration of the criminal class of young, black men could be the greatest boon to the social climb of blacks and African Americans in the US (for instance, being able to more quickly attain an even poverty and incarceration rate as whites)? If these men aren’t able to have children and raise families, then they won’t be able to pass on the sort of training that they received which lead them to a life of crime. And being, most likely, the poorest of the poor, by simply removing them from the population, you are in some respect raising the entire economic status of an entire group of people. With only about 40 million black people in the US, removing a million people from the general population is a fairly significant occurrence. What can we expect from this?
SOURCES
http://ag.ca.gov/cjsc/glance/graphics/13incarAJ.gif
http://www.visualstatistics.net/East-West/Incarceration/Inset.jpg