New York City is on track to have fewer than 500 homicides this year, by far the lowest number in a 12-month period since reliable Police Department statistics became available in 1963. But within the city’s official crime statistics is a figure that may be even more striking: so far, with roughly half the killings analyzed, only 35 were found to be committed by strangers, a microscopic statistic in a city of more than 8.2 million. If that trend holds up, fewer than 100 homicide victims in New York City this year will have been strangers to their assailants.
http://www.nytimes.com/2007/11/23/nyregion/23murder.html?ei=5065&en=e317f6d8d8c57dde&ex=1196485200&partner=MYWAY&pagewanted=print
vs.
The Impact of Legal Abortions on Crime:
"Evidence that legalized abortion has contributed significantly to recent crime reductions... appears to account for as much as 50 percent of the recent drop in crime"... as opposed to higher incarceration rates, stricter gun control laws, and increased number of police.
http://pricetheory.uchicago.edu/levitt/Papers/DonohueLevittTheImpactOfLegalized2001.pdf