By all means, argue against laws that prohibit victimless 'crimes' on the ground that these disproportionally ensnare blacks. But do not err in accusing all cops of targeting blacks, when the former are entrusted with enforcing the law, and the latter violate the law in disproportion to their numbers in the general population.
Ferguson: Angst vor einer militarisierten Polizei Junge Freiheit (in German), September 4, 2014.