Not every airport has a CFI or flying school and a CFI has zero control over licenced or unlicensed pilots. The field mentioned earlier with a poor licence and rego record has has no flying school presence and no CFI and it wouldn't matter anyway if they did. If there was one he would quickly become the town dobber and likely end up underground. I could have been flying unlicenced for the last 10 years and nobody would have known the status of my licence. It's possibly for someone to be a loaner and not talk to anyone about their flying or medical status.
You will never get rid of this element of aviation. Same goes for driving on the roads. The system is there and the penaties exists, SHOULD you choose to follow the system.