I don’t doubt there are abuses, but I guess I have been fortunate not to have experienced them. One of my parents’ ironclad rules when I was growing up was to be respectful and obedient to police, and it has always served me well. I greet them politely, do what they tell me, and we get along fine. (I would note that I have refined my parents’ rule to read: Always be polite to someone better armed than you!) Take it for what it is worth, but I have found that MY attitude and demeanor in approaching anyone, cops included, can make or break the experience. So I treat people respectfully, and it is almost always reciprocated.
So... Only the strong, assertive types should assert their rights? The sheep should just be nice and hope for the best? I’ll be a belligerent claimant thank you very much. Such men gave you the 4th amendment in the first place.