So most people I know who do a dramatic 180 hit a breaking point.
For all that the inaccurate "boiling a frog" metaphor describes how things work fairly well, a lot of people hit a wall at some point -- for instance, when "those people are bad" becomes "your best friend Joe is bad" -- and rebound. Once they hit that breaking point, the scales have fallen, and they begin re-examining everything.
This happens both with people raised in a particular worldview, as they gain experiences outside their original upbringing, and to people who fall into a cult, as the cult gradually ratchets up the craziness.
Of course, not everyone ever finds such a breaking point, and trying to push someone to find a lever to crack open their worldview antagonistically usually just makes someone double down, but a lot of people do find their way out.
What truth did Jones speak?