The rates have been found to usually be lower. But the demographic match, as Patler alludes to, is tough. They normally go with a similar age or age range. The Duke study below uses figures for 20 year olds.
https://stat.duke.edu/~dalene/chance...23.nflviol.pdf
http://sbronars.wordpress.com/2012/1...crime-problem/
From an outfit who politics probably don't align with yours, here is an overview of those two links and some other material: http://webcache.googleusercontent.co...&gl=us&strip=1