Well, some individuals are too stupid to be responsible for themselves. And a lot of violence, harm, and accidental deaths ensue because of it. Gun ownership is a right. But it's also a responsibility. But I do agree that any regulation should stop well before 'the point of insanity.'
This is not unique to gun ownership. The elderly cause a huge percentage of car accidents, deadly and nondeadly. More than any group except teenagers in their first year of driving. I don't want to take anyone's right to drive away. But some people are just hazards on the road and can't or won't recognize this. I think a driving test past a certain age to assess basic continued competence is called for.
With guns, it's harder. I don't think there should be any such blanket assessment. Gun ownership is a constituttional right where driving is not. But people who PROVE themselves irresponsible (such as leaving guns carelessly around the house for children to find and not training their children to respect guns) violate their repsonsibility. And should have their right curtailed if their irresponsibility causes harm.
Certain safety regulations are also appropriate. But I agree that many others are innappropriate (and ineffective) and that there is a danger of onerous regulation that does little good depending who is elected.