It's not a good point. Police, despite all the hatred they take, have a conscious and some morals. There's a difference between giving them an excuse and an obligation.
I'm a regulator and I don't look for excuses to harass, ever. I may get loose with my normal procedures when I have a very, very good reason to do so, but you have to understand two things about this. First, I'm opening up a can of worms that creates an *** load of work that I don't want. Second, if I overstep my boundaries there is less than zero incentive for me or a cop. Loss of agency credibility, harassment suits, jeopardizing my pension (cops are on a much shorter time frame with there 20 year pension requirement), and for me but not cops I would be pushing away potential future employers. Cops have a whole lot more negatives than that last one, however, since we can catch them on camera and they can face some serious criminal charges for being dirty.
We have a saying about those who abuse the system will eventually hang themselves. It goes in reverse for a cop only magnified from white collar crime and civil penalties to prison time and losing everything you worked for for years and years. It would take a helluva lot for me to even question considering thinking about maybe doing something shady. I guarantee cops have the same mentality.