Until the CPSC decrees that any gun lock weighing less than 100lbs is "unsafe" because a crook could just take away the firearm, lock, and all.
BTW, I'd guess that probably half of all the gun locks out there could be considered "unsafe" by an unbiased observer; so it's not a stretch at all to think the government might decide to declare all but the most expensive ones "unsafe".
Something like a strong cable lock I can see as having some value, insofar as a firearm can be cabled to something. But a trigger lock that does nothing to prevent a firearm from being taken, lock and all, to someplace where the thief can work on it at leisure, seems downright useless.
Can anyone explain any situation where a trigger lock actually does some good?