Nope pongo... depends.. matter of degree.  Mostly the advantage (as Abrahm's proved) to having indigenous police forces be as powerful as possible is... simply that we can't tell one arab/black/asian/indian whatever... from any other.
The police know when someone doesn't belong.   They also look at crushing fingers as a slight moral backslide when used to stop a suicide bomber from blowing up dozens of women and children in a town square.   
The trick is knowing when to stop crushing fingers because you have won.
lazs