First of all, what do you think of protected from myself?

We are not talking about slipping people some miracle cure that they are just being stupid about not taking. If that were the case, you would be right. At this point we don't actually know that it is a miracle cure and we are just slipping them some dubious substance that shows promise but may or may not help. We need more interested people to develop the art, but not the kind of people who will only be convinced by dark side mind control tricks.

Maybe when LW rationality is at a point where reasonable people could be convinced with empirical evidence, then it will be a good idea to trick the rest.

Ethics isn't just about right and wrong, it's also about not doing stupid shit that's going to bite you in the ass.