If you want to stop crime, of any kind, you have to stop the root causes.

Or effectively prevent them, or reliably prosecute them, or-- what, suddenly you understand game theory? When it’s convenient?

This is stupid. We can make things harder, and they happen less. Some obstacles work better, some goals are worth more effort, whatever. You don’t get to pull this motte-and-bailey horseshit. You went from declaring all self-proclaimed criminals will always always always get all the guns they want, to acknowledging that cost / complexity / time / consequences prevents a ton of access that would happen if there were no obstacles, to sort of mumbling and hand-waving that changes won’t change anything because imports and stockpiles and Jesus Christ have you ever seen a foreign country?

Even the solution you treat as a worst-case extreme is wrong. Almost nobody wants to ban all guns. That is a right-wing ghost story. But buyback programs, registration, and serial-number tracking can reduce guns available to the black market, and chase down the pathways guns take to get there, without stopping any particular ammosexual from collecting greasy toys.