Police are like anyone else, but with a difficult job.
There is no magic rule for dealing with a police officer.
If you have done nothing wrong, your best defense is being friendly and comply with his or her wishes. My policy has always been to try and give them respect. It usually works out for the best of everyone concerned.
I agree with your post. But make no mistake, there are those who enjoy lording over the people.
I do NOT subscribe to the “lower your eyes and your voice, speak as if your inferior and seek to please” method of “dealing with a police officer.” They work for ME. Of course only an idiot would say THAT to a cop!