Whoa, calm down. Sounds like you aren't that far from those "headcases".
We are not giving restrictions enough chances. What we are doing with restrictions is difficult to impose. Gun safe zones in this county and then the wild west in the next isn't going to cut it. There is no quarantine or account of people entering and leaving the county with and without weapons. Ban guns completely throughout the US with mandatory minimums should help somewhat. But what's really going to help is the free market. We already have gun manufacturers struggling despite high sales, with losing economies of scale they will struggle further consolidating into one or two companies who will hike up the price.
Banning them completely will also artificially inflate its price in thousands in the black market which will keep it off of the hands of moronic kids and gang bangers low on the totem pole.The ones that can afford them, the successful ones that are able to conjure up a few thousand dollars in one go already know the value of non violence thereby helping eliminate gun violence to substantial level.
You really want gun violence to die down? Let free market do its work after imposing the correct regulations.