Kids today may not be running around the neighborhood without fear like Beaver Cleaver, but the country is in the midst of low levels of crime not seen in decades, according to a report released this week by the FBI. Violent crime, which has been falling for five years, decreased 4 percent in 2011, according to the Preliminary Annual Uniform Crime Report. Murders are at the lowest point in 40 years. Violent crime, according to the FBI, includes murder, rape, robbery and assault.