Racist Careers?

I’m not sure what to do with Thabiti Anyabwile’s issues with the police.  The idea that police as a category have been an instrument of racist oppression makes perfect sense to me, but it confuses me that the way to address that is to permanently categorize the police as a tool of racist oppression.

His mom told him he must not, under any circumstances, become a cop, because the system would have him unjustly shooting other black men.  That almost makes sense, except that I’m pretty sure under similar circumstances, my mother would have told me by all means to become a policeman, so that I could reduce the number of my fellow Irishmen being unjustly shot.

I was raised on the philosophy that you should combat racism by feeling sorry for racists and helping them learn better.  My mom made me read Ben Carson’s book Think Big at an early age.

Can anybody corroborate Mr. Anyabwile’s story, or help explain it? Can a black man be a policeman without perpetuating racist systems?