The claim itself would be enough for me to vote for him, since that’s a risky power for Scum to have, but of very little value to Town. If Scum have a Cracker, then the Brig is worse than useless, since a Scum who gets brigged will just be released. Without that threat, though, Town has something very close to a second lynch (it’s more like a lynch than a Vigging, since even though it’s only two people who actually do it, it’s done completely out in the open). Meanwhile, if Town ever wants to release someone from the Brig, they can just tell the Captain and Chief to do so, and vote for them if they don’t cooperate.
As an alternative, Town might brig NAF and tell him to release himself, thereby using up the power and ensuring that Scum can’t use it (it’s still only once per game, right?).