I don’t know that the “gun” is what is at issue here. What if someone purchases a chronic alcoholic a car? What if someone purchases an anarchists’ cookbook for a muslim? What if someone purchases a dime bag for a pResident?
Where are the liabilities and who exactly is responsible for the giftee’s actions?
EVERYBODY should be responsible for their own actions.
the government prosecutes on the bases of “guilty until proven guilty”.
prosecutors as a whole operate on the basis of “everyone is guilty” and therefore there can never be a wrongful prosecution.