Because rationality isn't about following reason where it takes you, it's about sticking as dogmatically as possible to the 39 articles of lwrationality as laid down in the seq-tures.
Rationality is indeed about following reason where it takes you. This is very different from following wherever someone would have their feelings hurt if you didn't go. Of course, rationality also involves the use of priors, evidence, and accumulated information over your entire lifetime. You are not merely allowed but required to assign a very low prior, in the range of "bloody ridiculous", to propositions which contradict all your available information, or require some massively complex rationalization to be compatible with all your available information.
Another month, another rationality quotes thread. The rules are: