And it's interesting that you keep hammering in a direction that clearly isn't going to go anywhere in the US, while disregarding potential avenues that might as 'diverting'.
I think extreme hoarders/fetishists (tons o' guns, end of world guys) are probably in serious need of some kind of intervention the way any hoarder would, with specific focus on why they think they're necessary. I think some kind of program should be set up to look into why Americans, as a whole, have a desire to retain weapons in their home/on their person, what causes that to persist, what could be done to alleviate it, whether or not it should be alleviated, etc.
There should absolutely be an 'outreach' program to many of our citizens who have any kind of mental issues/quirks that might cause them to snap, regardless of weapons that may or may not be used.