Still at a loss as to the relevance. Nobody seems equipped to say.
Cars are large lumps of metal, that, in the hands of an idiot, can kill lots of people. In the USA, they have recognised this and so people who want to drive cars have to pass a test and be licensed. If they demonstrate serious incompetence when in control of a car, they can lose their licence. Furthermore, it is necessary to carry insurance if you want to drive your car on a public road.
It is insane that similar regulations are not in force for the possession and carrying of firearms.