Several of these comments set me thinking and musing further.
Into my mind came a remark from the brother who was instrumental in converting me. I want to be careful here not to give too many details, because I don't particularly want to be too publicly identifiable, although it may already be too late for that! One day during the "study" session with him and his wife I'd argued over a point, and he said "oh, we all have doubts".
now, this was interesting to me. He was a convert from my own religious background, and had been brought up as part of a large churchgoing family who still struggle with him as a JW. He'd married the JW woman who brought him into the "truth" (lie). I often wondered if he'd have become a JW if he hadn't fallen in love with her after the breakup of his own marriage.
It seems to me, after eighteen months or so on here, that people reach an individual tipping point, when suddenly enough is enough.