http://en.wikipedia.org/wiki/Crime_in_the_United_StatesThe rate of violent crime in the USA in 2009 was more or less the same as in 1979. Homicide rates have stagnated. And they are still far higher than in Europe. Access to good birth control (ie legal abortion) in the 70s and a massive drop in lead exposure (which is well linked to crime levels) are also important contributory factors. In fact, if you look at the graph, you can easily see that a massive drop in crime coincided with the Clinton administration, and tapered off as Bush 2 came into power.
Open up the page. It is a lot higher in 1990 than in 1979 or 2010.