I think it requires both. Attack the root cause of crime and remove the tools of violence.
The second amendment never meant to protect military style weapons. It’s absolutely crazy that random people run around with AR-15s for “defense.” Makes no sense.
Unfortunately, the “bad guy with a gun” all too often used to be a “good guy with a gun,” but life turned sour and now they are going to take it out on a bunch of 2nd graders. And because they have the good-guy tools, they can. Nuts.