"sensible"? Since massive amoutns of guns have found their way to the public since the 1990s the crime rates across the US have been dropping dramatically. And even so the US isn't even close to the top of the list worldwide in per capita murder rate even though lots of people have weapons.

If anything those numbers show that there is at the very least no correlation between numbers of guns and crime, and may well indicate more guns means less crime. Since the US constitution protects ownership with the "shall not be infringed" clause and the stats show there's little downsides why stomp on people's rights?