I'm not sure when a plumber and accountants perform life threatening procedures. You could argue with an electrician and engineer (civil engineer designing a bridge... ), but it's a pretty weak argument at best.
I always thought that medical interns aren't going to be performing "like crazy brain surgery" alone. They will assist and watch those procedures before given the knife?
Most of them aren't even going to be doing anything.
And arguably builders, plumbers, and electricians are nearly as important, since if they screw up it's a huge impact on quality of life, and apprentices in my experience get a lot more leeway and freedom. Engineers are arguably more important because they are responsible for the safety of hundreds, thousands, or sometimes even millions of people, and again, they are given a huge amount of leeway.
And as I said, interns aren't really called upon to do anything. Most of the time they just stand there watching, or holding a clamp. Plus, dissecting a cadaver not the same at all to operating on a live human being.
Lots of ignorance about how medical education works. Patients in teaching hospitals have better outcomes in general, because two hands/eyes are better than one. Residents don't operate on their own, they always have an attending there with them.
If you don't want residents involved in your care then go to a non-teaching hospital. Going to a teaching institution and screwing with their regular workflow is an excellent way to get sub-par care.
This. It seems you are under the impression that fully qualified professionals don't make mistakes. The fact is they do, and when they do they're usually worse about it than residents, interns, and students, because they haven't yet developed the arrogance and cynicism to think that nothing could possibly be their fault.