Black men overwhelmingly commit most of the crimes in the U.S. Do then white people get to act on their prejudices?
Second. If by acting you are saying destroy systemic racism that create the fact black people are outcasted by society, marginalized, lost in poverty and therefore overrepresented in prison, then yes, white people should act and destroy systemic racism.
You see, in one case there is no prejudice because all men ARE in fact all sexist in their lives and in the other there is one because its racism the problem and not black people.
So your comparison is fallacious.
You are once again proving that you are not a leftist since you don't understand the difference here.