A brain washing religious cult , how and why would any one come to that conclusion ?
Mary's example makes the obvious obvious.
It's true that when a JWS is confronted with adversity in the preaching work this to them presents a confirmation that
they are doing the true gospel preaching which makes them stand apart from the other Christian faiths, call it a oxymoron of human psychology.
Sadly I've seen many circumstances of JWS having a glazed cult driven look on their faces constructed out of a mind set of delusion and suggestion,
which gives credence to how easily are psychology can be played with and manipulated.