They want to fight racism and injustice, fine. Fight it where it really exists. Hanging 3 innocent white kids isn't doing a thing to further their cause, it's just making them look like idiots or worse.
I don't think it's "they" that are hanging 3 whites. ..I think it is a self-interested WHITE prosecutor that is slyly leveraging African-American angst for his own political gain. It is a strategy that is used repeatedly because. . .IT STILL WORKS. . .sadly. It is the ironic and sad continuation of misfortune that African-Americans would be freed from one slavery only to be ensnared into another.
Au contaire, it will embolden them. The more someone gets away with something, the further he tries to "push the envelope".