Genghis:
How can the driving system be so irresponsible as to allow drivers to pass a driving test without proving their ability to drive safely and independently before the test?
Or, alternatively, "how irresponsible would it be if the driving system allowed people to go off driving solo, with no supervision, before they'd passed their test?"
Flying's totally different. It's much more predictable and procedural. You don't (usually!) get other vehicles or pedestrians pulling out right in front of you in a plane, and you have three dimensions in which to manoeuvre.
NS