Many are in the JW cult because it gives them an identity. They formerly did not know who they were or what the hell was going on. Becoming a JW gave them a platform to view the world, a very jaundiced viewpoint but a foothold, an anchorage point. The club they have joined is like a surrogate family; all deluded but a kind of family nevertheless and with an over the top hope of defying death and living in paradise.
Putting a JW on the spot and telling them the org admits they are wrong only increases their grip on their futile delusion, even if there are paedophiles in the congos and corrupt elders and lying GB; the pain of losing club membership and loss of the ticket to paradise is too much to bear.