Adams' list is a jump-off point, and was included for illustrative purposes only. Cults and propaganda won't make the cut. I wouldn't think hypnosis would either (although I'd be interested hearing your anecdote).

"Dark Arts" on LessWrong has a specific meaning. The accusation has merit; this program intends to influence others based on factors other than rationality. However, I (and others) have argued that learning this type of material is:

1. a good exercise in instrumental rationality.
2. necessary to accomplish things in the real world.
3. possibly a requirement to get people to consider the merit of your ideas at all.