Ok, so according to the VPC, 151 CCP holders have been charged (not convicted, charged). For the purpose of this math exercise we'll accept their number, for now. That's over an almost 3 year period: May 2007 to the present. It's currently the end of March, so that makes 151 in 35 months.
From the FBI:
http://www.fbi.gov/ucr/cius2008/offenses/expanded_information/data/shrtable_08.html
Number of homicides by year:
2006 15,087
2007 14,916
2008 14,180
So (15087 + 14916 + 14180)/3 = 14,727.67 average homicides per year.
Now take that # and divide by 12, so 14,727.67/12 = 1,227.31 homicides per month. Now we can take that number and multiply by 35 months (the length of time the VPC is using) and we get 1,227.31 * 35 = 42,955.69 homicides. Note I could have just added all 3 years from the FBI, but then I'd have a number for 36 months, but I need a number for 35 months since that's the VPC's time frame.
So, 151 out of 42,955.69 is 0.00352 (murders committed by CCP holders). The 2010 census numbers aren't out yet, but according to Wikipedia the over 20 number of Americans is around 224,000,000. Sadly, they don't seem to have an over 21 number, the age needed for a CCP. But if we figure 6,000,000 CCP holders out of, say, 220,000,000 we get 0.027.
Hmmm, 0.027 is a bit bigger number than 0.00352. Without an exact over 21 number from the 2010 census we have a slightly less than scientific number with the 0.027, but it's still pretty close and still a lot bigger than 0.00352.
So, it looks like a CCP holder is less likely to commit a homicide than a non holder. You might want to pad your 151 in almost 3 years number Josh, looks like you're hurting your case.