I agree that "locks keep honest people honest" is a nice but bogus sentiment. Bike locks are a clear counterexample. While a cheap cable lock will keep honest people honest, your bike will soon get stolen. A Kryptonite-style lock is kind of the minimum. But even those need constant upgrades as bad guys figure out how to pick them or freeze them with canned air. Thus, the goal of a lock is to make it not worth the effort for a thief, not to keep honest people honest.