Knowledge of the individual exploits does help, though it's not infinitely generalisable. There are lots of people who go "hah, that's ridiculous" about many cults before falling for another one. Because these things basically work as security exploits of your basic human cognitive biases.

Possibly if you had a reasonably complete catalogue of cognitive biases not only present as a list in your head, but with personal experience of having been bitten by each and every one, that might help. Better would also be personal experience of defeating each and every one, but that might be asking a lot of most people. Me, I don't even have the list.

A nice defensive intro to the dark arts of Scientology, and a cracking good read, is Bare-Faced Messiah by Russell Miller, a biography of Hubbard. (Out of print, freed for the Net by the author - a mainstream journalist, not an ex-Scientologist.) I read it and thought, "Hah, this is easy, I could do that! If I had no ethics and literally couldn't tell true from false."

One problem with Scientology being the best-known cult is that they are actually the Godwin example of dangerous cults. I can't find the reference, but I have read of sociological studies that they are the most damaging cult, based on time to recovery of ex-members. They make other actually quite nasty cults look relatively benign by comparison. It's pretty much as if your only referent for "authoritarian" was "Hitler", so other obnoxious authoritarianism looks relatively benign by being not as bad as Hitler.