A fair whack of JW's left after 1975 didn't bring the New Order. The ones that remained are the ones that the current JW's can still talk to. I remember hearing some of the jw's that were around for '75 referring to those that left as "75ers", claiming they were "serving Jehovah for a date". So the modern-day crowd neither lived thru it, nor ever hears anything bad about it. Labeling the ones that left over it just gives them more ammo for their "us-versus-them" mentality.
And, lest we forget, anyone that says anything negative about the "Mother Organization" is labeled an opposer.
The Watchtower (and by extension, jw's individually) are masters of rewriting history. Look at the spin they put on 1914. Anything bad is just swept under the rug and nobody peeks.
You're right though -- there's nothing you can show a true-blue JW that will shake them.
Dave