That law is already on the books - pushed by the NRA. All a city has to do is ask the Feds to Prosecute. The irony IS that a city almost never does; i.e. Chicago, because that criminal with a gun has family that Votes. (not sarcasm)
**** And in a similar vein, what about as gun owner who has their weapon used in a crime they didn’t commit (a kid takes a parent’s weapon from a secure locale and does harm)? ^^^^
Change 'Gun' to 'Hammer', or to 'Chain Saw', or 'Car', or 'Baseball Bat', or 'Knife', etc, and your question answers itself.
Odds are YOU own scores of 'weapons' that could kill someone - like a Parker Ballpoint Pen to the throat. Are YOU responsible if someone steals 'it' and uses it in a crime without your knowledge? That would be pretty absurd, correct.
Now THIS is an answer.
The analogy you use in the second half of my query makes sense (using an item in a crime), and is something I hadn’t thought of.
Putting it in those terms makes sense.
Thank you for your salient post.