They can. The social and ego hit of bailing is more than they can cope with, however.

If possible, show them kindness and understanding when they show signs of breakout out of the cult. It’s painful to take such a hit to your eg and admit your wrong. Too many people mock others in that situation. It just drives them back in deeper.

They could be. They chose not to.

It’s not that hard to be a decent person. Listen to other people. Respect their boundaries.