they could use it selectively to take away someone's guns. let's say someone gets on the wrong side of a politician who wants to wreck them. politician starts a

they could use it selectively to take away someone's guns. let's say someone gets on the wrong side of a politician who wants to wreck them. politician starts an "investigation" of the enemy, finds some very loose diagnosis of, say, depression, then has armed thugs raid the house and "remove all weapons", right after notifying the media. then the media leaks "our sources confirm $badguy was treated for an unknown psyciatric condition 2 years ago and tonight was found in possession of a high-powered rifle and out of concern for the safety of his family, his weapons have been confiscated". His reputation (whoever he is) is now shat on.