Re: fine with it.
@stopthebollocks - sorry, but the police, as an institution, has been shown time and time again to be racist. A quick Google for "police institutional racism uk" gives you ample evidence of this.
The problem is not that all police are racists, but decisions made are made on the back of information that is itself biased and racist. Its why stop and search invariably targets young black men. Its why black men in the USA are more likely to be killed when coming into contact with police than white men are.
If you have a requirement for due process when fingerprinting, then you eliminate a type of misuse. If its as quick as forcing someone on the street to scan their fingers on the whim of a police officer, then you create a much larger chance for misuse and abuse.
And, depending on the reason I'd need to call the police, sure, I'd call them its kinda one of the things my taxes pay for. I don't hold the overall bias of the force against individuals. Or the actions of individuals against all of them.