Wasn't his silence complacency?
Ray Franze was an old fashioned guy. At the risk of sounding mawkish, was it not a case of
"If you cant say something nice don't something at all".
Also, and I may be wrong here, was not Leo Greenlees made to leave because he was gay - not a pederast.
Regarding the correspondence, I get what you are saying. I have always felt that folk seem to go far for three reasons
They are intelligent
They dilligent/meticulous
They are energetic/hard working
Of the three the last two are far and away the most important ( In fact in my experience the first alone is more of a handicap than anything!). It seems to me Ray Franze had at least the first two characteristics in abundence which may explain the (well organized) attachment to his correspondence. But yes, he would have been foolish not see it coming and for him to say he didn't seems a little disingenuous.
Leading on from that, what I find interesting is that he so obviously didn't trust Gods 'loving, only true' Christian organization in the least!