"So when a black man murders my uncle and father over a dice game, can I feel the same way?"
If he did it on the premise of black supremacy, then yes, you could.
You seem to think this was a random attack on someone, despite their skin color. They were targeted because they were black, and were individuals that, who, at the time, held public offices, and positions in law enforcement. Even if you didn't condone hangings, you condoned segregation, and the other laws that treated blacks as subhumans..
You need to think through your responses. People like you, who don't even take their own opinions seriously, are part of the problem.