I see two parts to this. I see the lets-hang-him-in-town-square-to-make-a-lesson-out-of-him mentality and I see the lets-treat-him-like-a-naughty-child-who-needs-to-learn-his-lesson. Shunning has not worked on me from my parents and siblings, and actually seeing how a mother could desert their child, leaving every bit of natural affection behind has only served to demonstrate to me how important it is that I never go back to such mind control and that I teach my own children to think for themselves and trust their instinct above all else. BTW, isn't there a scripture about that being a sign of the times, mothers losing their natural affection? Well, lo and behold, they are fulfilling prophecy (said tongue in cheek of course).
I''ve said this before, but even if JWs, by so weird wrinkle in time, end up being right, I want no part in a system in which a god would treat his/her followers with such cruelty. No thanks, I'd rather be dead.