Ending crime one fetus at a time

John Tierney brings us an interesting commentary today that is likely to offend those on both the left and the right, The Miracle That Wasn't. It is about a debate on the reason for the drop in crime in the 1990's.

It is an inspirational urban lesson from the 1990's: take back the streets from squeegee men and drug dealers, and violent crime will plummet. But on Thursday evening, the tipping-point theory was looking pretty wobbly itself.

The occasion was a debate in Manhattan before an audience thrilled to be present for a historic occasion: the first showdown between two social-science wonks with books that were ranked second and third on Amazon.com (outsold only by "Harry Potter"). It pitted Malcolm Gladwell, author of "Blink" and "The Tipping Point," against Steven D. Levitt, an economist at the University of Chicago with the new second-place book, "Freakonomics."

Professor Levitt considers the New York crime story to be an urban legend. Yes, he acknowledges, there are tipping points when people suddenly start acting differently, but why did crime drop in so many other cities that weren't using New York's policing techniques? His new book, written with Stephen J. Dubner, concludes that one big reason was simply the longer prison sentences that kept criminals off the streets of New York and other cities.

The prison terms don't explain why crime fell sooner and more sharply in New York than elsewhere, but Professor Levitt accounts for that, too. One reason he cites is that the crack epidemic eased earlier in New York than in other cities. Another, more important, reason is that New York added lots of cops in the early 90's.

But the single most important cause, he says, was an event two decades earlier: the legalization of abortion in New York State in 1970, three years before it was legalized nationally by the Supreme Court.

The result, he maintains, was a huge reduction in the number of children who would have been at greater than average risk of becoming criminals during the 1990's. Growing up as an unwanted child is itself a risk factor, he says, and the women who had abortions were disproportionately likely to be unmarried teenagers with low incomes and poor education - factors that also increase the risk.

Bottom line, those most likely to be aborted are the most likely to become involved in crime. The debate turned into a non-debate when Mr. Gladwell said he had to agree with Mr. Levitt.

"My first inclination," he joked at the beginning of his rebuttal, "is to say that everything you just heard from Steven Levitt, even though it contradicts things I have written, is true."

A review of Steven D. Levitt's book can be found here.