in America, and England Black people do commit the majority of crimes. The thing about crime though is that the vast majority of it is race-on-race. Black people are committing crimes against each other, Hispanics commit crimes against each other, whites commit crimes against each other.
My personal belief is that it's not so much about the color of your skin, as it is about how educated you become. Whites are the lowest crime statistic of the big three, but they also tend to be better educated, which helps them make more money. The majority of white crime is committed by the poorest and least educated among them. If these statistics show anything, then it's the disparity of education and the opportunities it can lead to in America (Can't speak for England.)