Address the real problems
This is a very early opinion, but in my view, the crime of enablement, allowing someone with deep mental issues access to weapons, happened first.
We can channel this ban energy to accomplish something meaningful in legislation, that actually makes the public safer, without alienating the lawful population of gun owners. Something along the lines of "Security of American Firearms Act". If you have a black gun, get a safe and lock it up, too.
Secure your weapons. Be responsible. Don't give the combination to impaired family members. Prevent loss from burglaries.
With great power comes great responsibility. This is very early, but it's where my thoughts lead me.