The idiot is going to cause trouble because he is an idiot, not because of where he got his racing license. In my limited reference, many of the newbies from the pro driving schools have a much higher level of competency than many long time SCCA racers. IMO, the biggest problem is too many "poor drivers" racing cars that are beyond their capabilities ...... arrogance and ignorance ...... which again, has no fix.
If you read through this thread, it is like any political situation. Everyone has a different opinion on the causes, and different opinion on how to fix it. Which means it won't get fixed. We just need to deal with it the best we can.