The thing is some just don't get the whole idea behind operating any bit of machinery be it car,plane or boat or even a generator.
Yes they can demonstrate sufficent skills to be able to be allowed loose with said items. But in reallity it doesn't matter how much training you give them they will never be at one with said equipment. Every control input there will require a thought to be be processed reflected on if thats the right thing to do then actioned.