A motoconcho drove into me once, I paid them off to just ignore me as I couldn't be arsed with a visit to the slammer for something that was the conchos fault, and it wouldn't have gone my way, not around Sosua. That is one thing more than most that puts me off that area, the law really are there to cause stress and do absolutely no good what so ever.
I've had a couple of tugs in the capital and never had any problems like that. In my experience the law sort of do something resembling the job description, albeit not ideal by a long shot. If you are just going about your day normally it isn't as intimidating to see a road block, or random tugging.
In the north people see the law and turn around, even if only carrying 2 carrots and a bag of sprouts.
I wouldn't expect expats to put up with it who live down there, I reckon most have enough spunk to tell them where to go, in some kind of submissive manner.