I have no idea why unmatched graduates are working at McDonald’s as you say. There’s always primary care positions open for the scramble last I checked. If they can’t get a spot there’s likely a real issue in their education or themselves. It’s a normal distribution of a population, MD or not.
I can’t speak to what NP and PA’s do - they have their own PACs and organizations. I know they want to increase their scope of practice and keep their liability low.