Suggestion, come after the criminals and crazies first instead of leaving them alone while you strip the law abiding.

Problem is, who is crazy or criminal (or both usually) is revealed only after the fact.

Only after the fact.
Only after the act.
Too late to redact.

Sorry 😀

Americans have an "endowment effect" when it comes to guns. That's the fancy way of economists call overvaluation of what you have. For example, you won't want to sell a stock you own for the same price you would be willing to buy if you didn't own it already, but higher.
Imagine if the constitution had prohibited gun ownership instead. Then I come to you and say "anyone can have a gun but it will cause 40,000 more suicides, 40,000 more homicides and oh yeah, crazies shooting innocent civilians randomly for pleasure." Would you not say "No thanks" to that proposition?

Ancient canaanites burned their children in front of Molech because well, that's what they were used to. A custom turned into a religion. Today's Americans are sacrificing their children to guns because they don't know any better. And don't want to.