The guy who was behind the trigger probably laughs at you and your gun control laws. In fact any laws.
Nobody? Not police? Not govt?
How about folks who know how to use machine tools? (Guns are surprisingly low-tech.)
And yes, it might make even the dumb, and gangsers think before drawing a gun in public and shooting away. Nothing will be perfect but I think looking at most other countries gun shooting statistics we can see it can greatly decrease it.