If you freed up the ownership of guns, what would the limits be? What would the lower age limit be (or the upper limit for that matter)? How would you police it?
How would you justify the increase in the amount of 'accidental' shootings? People who are fully trained in the use of guns get injured (granted, in the case of the UK armed forces, it's normally because they've been shot by the Americans

), but just opening it up to Joe Public? I would say that public safety would probably be threatened
even more than usual if anyone could carry a gun.