Looking at the demographic it seems there is a cultural spillover from Hollywood at play here too. Young black men are the major villains on television and in many films. There is a mythology built up over time that has spread world-wide, given the broad audience and wide popularity of American entertainment. Many folks (especially inside the US) seem to have been conditioned to see a correlation between being a young black male and being engaged in some sort of criminal or violent activity. Many also falsely associate this correlation with causation. Perception (even based on a false correlation) can be much more of a driver that of what people think vs. the reality of a situation. It does not help either that we tend to cherry pick the facts to fit our perceived story. The result is stereotypes, profiling and negative experiences for part of our society.