Belief is dangerous stuff. Especially when it is dangling delicious carrots such as "eternal freedom"; "freedom from the birth-death cycle"; "cleaning up the entire planet"; blah blah blah.
I too have run into folk who have left what they term "organised scientology" but who are shut down to moving towards acceptance that the system Hubbard designed (stolen from others, etc., etc.) was a somewhat sophisticated form of spiritual slavery. I hesitate to judge these folk who remain confined within what I term the "mind control tunnel" because, for me, it was damn hard work to break out of the mental prison. I realise the fears others face. However, ultimately it comes down to choice.
The "false doctrines" you mention, to me are like the tunnel walls - the invisible prison walls that one is conditioned to never look through. Dismantling those walls (the deeply entrenched conditioning) takes work,
real work. It is not a one-step-all-is-fixed - flick a switch - process. The scientology conditioning actually works hard against individuals even when they do decide to "give it all up". The training, right from day one, creates an identity, a perspective, that one is capable of "super powers", is "better than", elite. That conditioned in arrogance removes humility which is absolutely necessary if one is to make any genuine personal growth, and move towards one's own sense of self. That sense of self is not based on any system, religion, others ideas, etc.
Scientology prohibits any real personal growth (true sense of identity/self) because everything is based on a systemic approach to "spiritual freedom".
I am concerned this may not make any sense. These are fairly deep concepts for an old(er) gal like me.