I just think that a lot of JWs who have had their eyes opened have opened them fully.
I think JWs who spent their lives scrutinizing the most innocuous passages of the bible and coming up with deep meaning, and also getting explanations for the most blatant contradictions.
As JWs, we have spent our lives studying the bible.
Each book and verse were examined for deep meaning, and prophetic significance.
Year after year we were given "explanations" of who the most idiotic stuff fit into scientific truth.
Year after year, the most blatant contradictions were either causally explained away, or some over arching future structure was added to it so it would make sense when god explained the details.
We had it pounded in that we are the ONLY true religion, and many people would "ironically" express "if this isn't the truth then there isn't one"
After all that and more, its hard to come to the conclusion, "oh we got the trinity wrong, but all the other stuff is still ok", if you know what I am saying.