This won’t change any minds. They will say that all guns start out owned by legal owners. They will say that they only way to keep guns out of the hands of criminals is to outlaw all private ownership.
There is a variant to this where they want to make it prohibitively expensive to own a gun. One way would be to require gun owners to have insurance that would indemnify any one for any damages caused by the gun even if the gun is no longer owned by that person. Or, more simply, make the gun owner an accessory to any crime committed by anyone who later owns that gun regardless of how that criminal acquired the gun. Even if a person stole your gun and then used it to kill someone, you would be considered an accessory to that murder.
If you voted Democrat you approved abortion; therefore you are an accessory to all THOSE murders! Turn it back on them.