That's all really great, balanced advice.
One of the best take-aways that I got from Hassan's book is this: never discuss doctrine.
Why not? Because mind-control groups aren't really about doctrines or beliefs. Sure they all have this or that ideology or belief system which they tout as "the truth" but that's just the window dressing. The fact that those beliefs can change and often do change at the whim of the cult leader is proof of that.
Cults are about one thing: control.