Well, at the local level, you reduce the gun supply as more guns=more insurance=less grey/black market stolen guns. Importing guns from another state bumps the price and makes them pricier for the local thug. We've gone over this supply/demand problem when it comes to guns.
This guy has to work for gifford's. It's the same non-sense talking points over and over again that give off a sense that he has a solution but is really just talking out of his ass. Literal diarrhea of the mouth and constipation of the brain. How about you talk about regulating something you understand, like eating tide pods?
You neither understand the economics of firearms, nor the motivation for the people possessing them to retain them. You should go ask your buddies over in Australia and New Zealand how well their forced confiscation worked. I'll save you the time - it didn't. In NZ it was so poor they've done something like 2 or 3 more and barely collected more. It would appear even in the modern leftist meccas gun owners understand the utility of having an equalizer when the thugs have better guns than you do.
And local thugs? Vice has ran several documentaries on Africa, Colombia, and Filipino thugs that literally take a 2x4, some plumbing pipe, and a nail and make a fully functioning weapon capable of being used to acquire an even better weapon from someone. Do you plan on including requiring licensing and insurance to shop at home depot? Maybe we should do background checks and force people to sign 4473s when picking up some roofing nails and galvanized pipe!