I think he's asking me why I changed my mind. He already knows what a priest will say, but he's struggling with scruples.
Well, I'd say one of the things that made me change my mind on NFP, was that someone I respect, a priest in France, saw no problems with it, nor did any of the French clergy. It became increasingly hard to believe that ALL the clergy would be wrong. One day the fog just lifted and I realized it was a true teaching.
I was never a Feeneyite. I had some problems with the invincible ignorance concept for a while.