Another way of looking at it:
There's a feeling that airline pilots who are also sports pilots may well deal with emergencies better than those who are not. Sullenberger would be a good example.
But accidents are orders of magnitude more common in small aircraft. Given 'no-accident' stipulations, a rational airline pilot should therefore give up sports-aircraft flying in order to reduce the risks of losing his/her career.
Is this to the benefit of airline safety?