Hey I have an idea.
Prosecute people who use or intend to use [1] guns to commit crimes and to do actual harm.
[1] I realize this allows an extreme amount of abuse by prosecutors. I don’t know how to fix that except to prosecute the prosecutors.
Simple.
Leave off the bit about “intending to”.
The number of things I “intend to” do at a given moment that never get done, for good or ill, astounds even me.
And some of ‘em would give governments nightmares...