Although not common on the Discworld there are, indeed, such things as anti-crimes, in accordance with the fundamental law that everything in the multiverse has an opposite. They are, obviously, rare. Merely giving someone something is not the opposite of robbery; to be an anti-crime, it has to be done in such a way as to cause outrage and/or humiliation to the victim. So there is breaking-and-decorating, proffering-with-embarrassment (as in most retirement presentations) and whitemailing (as in threatening to reveal to his enemies a mobster's secret donations, for example, to charity). Anti-crimes have never really caught on.
~ Reaper Man, Terry Pratchett