The short answer: Wikipedia editors are volunteers and African-Americans
rarely volunteer.

The medium answer: African-American editors often edit only articles
which relate to African-American and do that in a point of view way.

The long answer: large blocks of African-American are oppressed,
unemployed, poorly educated, and computer illiterate. Those that are
educated and prosperous tend to be too busy, and as said, are not in the
habit of volunteering.

A reaction like this is expected to any honest straightforward
observation that is not politically correct. I lived in the Five Points
neighborhood of Denver for yeara. I like Black people, but there are
issues.