Drawing conclusions without facts to back them up has sure become the FR way, but FWIW Waukesha is a solid Republican area and 88% Caucasian.
The race of a perp is no longer given if he is in custody and not a threat, and identities of 15 yo juveniles are always protected.
If the cop was white and the perp black, do you think the race of the perp would be kept a secret?