Perhaps trickery was a misleading word. The point, which I believe holds, is that people think they are doing it because it is morally right, but they are actually doing it because it helps them; there is an ulterior reason. But you do not judge them by moral values. The moral values are false values, facades for the real values, impostor values. They do not make things right and wrong, they just stand as approximations of why things are right and wrong. But once we've realised why we have moral values, you no longer need to hold them. You can work out which things are helpful and follow them. Yeah, pretty much.