One counterexample can't outweigh a lot of positive examples, but we don't have verified positive examples of people making the reasoning error the OP claims -

One counterexample can't outweigh a lot of positive examples, but we don't have verified positive examples of people making the reasoning error the OP claims - we don't have verified positive examples of people secretly thinking what OP claims they were secretly thinking. It seems to me that I went through the same thought processes that other people worried about FWS say they underwent, while being in an utterly different context from what OP is claiming to produce motivated cognition. That makes me extremely skeptical that OP is correct in trying to thus undermine the thought processes producing worry about FWS. In this case it's not clear that OP is successfully generalizing over any of humanity.