The other thing to be said here is that, despite the risks of cooperating with a police enquiry, if the choice is between them using objective geolocation data to identify possible leads, versus them stopping off for some donuts before driving around until they find a black guy, then we surely all agree which is preferable.

I guess my justification for my comment is along the lines of "it takes compromise for two parties to start getting along and start improving things". One small compromise that could be made is for white people who don't need to worry about false conviction to not treat a situation like this adversarially. Possibly, that could ultimately lead to improved community relations and an abatement of police racism and general brutality and despicability.