Ok... just read this whole thread. I have a headache.
I am in favor of regulations that prevent individuals from doing harm to other people. My enthusiasm for regulations that prevent individuals from potentially harming only themselves is considerably less. With aviation, there are so many variables that finding the appropriate tightrope to walk between the two is difficult to say the least. Should a person be able to fly whatever he/she wants to, whenever he/she wants to, as long as it's over and around unpopulated areas and they are alone... and are financially responsible for any public resources encumbered in cleaning up any possible mess aftewards? I'd argue yes, they should, but that's an almost impossible scenario anyway. Should someone who's a high stroke risk, alcoholic with multiple DWI convictions, and a history of suicide attempts be able to fly over a town with a couple passengers? I'd say no, and I doubt there'd be a need to argue for that stance. Sooo... where's the appropriate middle?
For most of my life, I drove on average probably 100 miles a day, usually with at least one passenger, and shared the small physical space that is our highways every day with hundreds of other motorists also driving vehicles that weighed at least one ton, and usually far more. On two-way roads, with vehicles bound in opposite directions both going 60mph, a head on collision would have been calamitous, and that possibility was there every few seconds. For the right to do this extremely dangerous activity, we had to take a 20-questions multiple choice test, prove we could see the first couple lines of letters on a wall, and take a short practical driver's test. That's it. The opportunity to harm others on the road is FAR greater than it is in the air (speaking of part 91, not airline or commercial ops).
I know the contrasting opinion to that has been stated before, and I can agree with and understand the reasoning behind the argument that cars themselves and car accidents in general are "safer" and more survivable than aircraft accidents; every landing (forced, accidental, or intended) is a contact between a stationary, massive object (the ground) and something moving at a relatively high rate of speed (the aircraft), so the potential for mishap is greater than when parking a car, obviously. That is a fair point.
We already have minimum training standards in place, far beyond those necessary to be allowed to drive a car. We already have examinations and practical tests in place, far beyond those necessary to be allowed to drive a car. If you are healthy enough to posess a driver's license, and mentally and physically capable of completing the training and certification necessary to obtain a PPL, then that should be enough for part 91. To be honest, I'd rather see the minimum standards raised for obtaining and keeping a driver's license.. that would make the roads AND the skies safer.