Let's teach 'em a lesson, eh? The same sort of mentality a cager has when he's buzzing you on purpose.
This locking "technique" is sure stupid, but it's perfectly legal. But if you move that bike or lock it with your own lock, that'll be criminal actions. Why be a d!ck doing illegal things to cause somebody who did you nothing wrong a lot of trouble? Be grateful that when the real thief comes along, it's that bike that's going to be lifted and not yours.
WTF, people? Do you try to "educate" people who leave their bikes unlocked and go in to a store for "just a second"? How about messengers freelocking their bikes? How about people who only lock up with a tiny cable? Do you threaten lonely pedestrians in bad neighbourhoods after midnight? Do you steal someone's wallet cause the owner was stupid enough to put it on top of the groceries in his back and then put the bag down next to you on the subway and turned away? When driving, do you buzz cyclists who are hugging the curb to teach them that they should be taking the lane?..