In an explosive interview at the National Association of Black Journalists convention, Trump—challenged over his racist rhetoric—claimed the line of questioning was “disgraceful.”
He went because his strategy is to peel off any low-info black voters he can.
If you go into a community that overwhelmingly hates you, you can never do worse than where you started. Notice the handful of presumable plants cheering Trump on in the crowd, too.
He gets his few talking points in and some "respect" him for reaching out to the community and that's all he's after.