Well, raw numbers are useless in solving the mysteries of statistical phenomena, especially if you happen to artificially inflate those numbers, using mixed data, as Moore did.
here is a neat little graph on per capita (per 1000) murder rates for the top 100 countries in the world.
The US is 24, at .04 per 1,000, which roughly equates to 11600 murders.
Then again, in Canada, he uses a biased sample (just happening to find a crowd of black people in Canada, saying they have a mixed ethnicity, which they don't, Canada's black population is proportionately 1/4 of what it is in the US (3%, compared to nearly 13% in the US) and it only follows that Moore is trying to mislead on this point...