Given the national mentality when this video was released, MJ already did his best to express the frustration and anger the black community felt at the time (1991). He did it through metaphors and artistic expression because anything more would have been met with harsh opposition.
In fact, the video was still met with harsh opposition. The sign on the window he smashed originally had the Klan and NAZI written on it. The TV stations including MTV made them remove it. However, once the video was released, people were still angry about MJ expressing the frustration with institutional racism and using the imagery of a black panther, that they forced the removal of the black panther dance from subsequent airing of the music video.
I mean itās easy to be where we are and point out how MJ could have delivered his message, but he was putting things on the line and did it anyway.