It's more like "you think going to church advances your goals, but you're wrong because you haven't taken into account the fact that going to church with irrational people makes you more irrational/insane." I guess it's a reasonable assumption that one of my goals is to become more rational, given that I'm on LW, but apparently people don't give me the benefit of the doubt for having thought about that already on my own, and made a decision one way or another.