FBI Director James B. Comey is reported by The New York Times to have said some forthright things about relations between black Americans and the police. Bluntly, Comey talked about black and white Americans, and the different experience police have with members of each group.
Essentially, he said what we understand to be true: based on their field experiences, police (of any race) can (and do) expect more criminal behavior per capita from blacks than from whites. Most of that crime is directed at, or at the expense of, other blacks. Comey also wrapped his straight talk in the expected liberal pieties to soften the blow, and keep his job.
Being more cautious around Rottweilers and pit bulls than with cocker spaniels and golden retrievers is sensible, normal even. Why doesn't the same profiling reasoning apply to various subsets of people?