If you're interested in total homicides take a look at the homicides rates for the past 60 years: http://i.imgur.com/3bFjZu4.png

2010 was about the same as it was in 1963. Homicides are not a growing problem in the US. Homicide rates have been dropping for years.

I got that chart from the Bureau of Justice statistics. http://bjs.ojp.usdoj.gov/index.cfm?ty=pbdetail&iid=2221