I think it's far fetched to say 90% overall in total. It's more like 51% according to the latest update: http://www.bjs.gov/content/pub/press/jim13stpr.cfm

Not to get into an debate in this post but I think it's relativity bias to say 90% of crimes goes on in mainly Black/Latino communities when it's every community.

If you think you are too small to make a difference, you haven't spend the night with a mosquito.
- African Proverb