"Locks are for honest people" has always been true. The question, in this case, is one of tradeoffs. I'm significantly less worried about determined malicious intruders in a public restroom than I would be over a LAN. The former would be personal (or at least random) and likely to be caught whereas the latter would be anonymous and with something to gain.

I take his point, but I don't think it's a good example. Bruce does better with this sort of analogy.