Eliezer, it's possible for there to be a good argument for something without that implying that you should accept it. There might be one good argument for X, but 10 good arguments for not-X, so you shouldn't accept X despite the good argument.

This is an important point because if you think that a single good argument for something implies that you should accept it, and that therefore there can't be any good arguments for the opposite, this would suggest a highly overconfident attitude.