That it is black is not racism, there are real factors that make them bad areas. You are far more likely to be accidentally show in those areas (even though the good neighborhoods may contain as many guns, they are not used in those areas). You are far more likely to be assaulted.

Those are also the cheap areas, and black families tend to move there just because they are poor. Of course the gangs in the area thus can recruit young local black kids (not being a member of the local gang can be dangerous). It isn't racism though, it is just reality - one that is very hard to escape for black people.

There is racism in the US as well, a lot of the current problems are rooted in the historic racism.