Wanderer,
I don't know if I have a turning "point" per se, more like several 30 degree turns that ended up in a 180 in 2005. The first of which was learning of the 1975 debacle. My family had been "in" since '78 and I never heard a damn thing about this until around 1991 or so. It was quite shocking to me, actually. The 1995 generation change bothered me somewhat, but more just because the new explanation was, well, unexplainable. I felt the same way about the blood policy changes in 2000. I nearly left in '01, but didn't have the balls to until '05.
Jason