It's impolitic to mention, but black Americans commit most murders in the US despite their small share of the population. Black American women are more likely to commit murder than white American men, a sex reversal unique between large racial groups in the developed world. An average black man in the US is orders of magnitude more likely to commit violent crime than a non-black man.

The overwhelming majority of black Americans are not criminals. It's important not to draw the wrong conclusions here. But the small percentage of black Americans who are criminals make up a proportionally much greater share of the whole. The reasons for this are complex and controversial, but it's some opaque combination of history + discrimination + nature + nurture.