That's the premise in a new book called Freakonomics.
Interestingly, I found this review of it in the Weekly Standard of all places that pretty much accepts that premise as gospel.
http://www.weeklystandard.com/Content/Public/Articles/000/000/005/570gfjke.asp?pg=2FREAKONOMICS IS MOST LIKELY to become controversial (and perhaps notorious) because of its chapter on crime and abortion. During the first half of the 1990s, a bewildering variety of experts forecast that America would soon be engulfed in a virtual tsunami of crime.
Happily, these prophecies of doom proved wildly off base. To paraphrase an old saying, failure is an orphan but success begets a thousand politicians vying for the credit. In this case, there were several seemingly plausible explanations for the non-explosion (and indeed reduction) of crime. Some experts said Rudolph Giuliani's and William Bratton's innovative way of implementing Jams Q. Wilson's "broken window" theory of sociology saved the day. Others pointed to tougher gun laws. Still others suggested more policemen or more widespread use of capital punishment deserved the
credit.
While it was wonderful to believe that the aggressive removal of squeegee men or some other easily implemented--and therefore easily repeated--policy decision saved our society from the super-predators, perhaps the actual explanation for society's success in this struggle is more disquieting. Levitt convincingly argues that the fortuitous drop in crime of the late 1990s was due to 1973's Roe v. Wade decision.Here is Levitt's theory boiled down to its essence: "Decades of study have shown that a child born into an adverse family environment is far more likely than other children to become a criminal. And the millions of women most likely to have an abortion in the wake of Roe v. Wade--poor, unmarried, and teenage mothers for whom illegal abortions had been too expensive or too hard to get--were often models of adversity . . . Just as these unborn children would have entered their criminal primes, the rate of crime began to plummet." Levitt goes on to support this assertion with an almost unassailable statistical analysis (although given the discomfiting nature of his argument, it is likely to be vigorously assailed nonetheless).