I thought that Peter Smith's reply was fine, too, until I read this new question and Prof. Stairs's reply. So I went back and re-read the original question (2823) and Smith's answer, and I wonder if this isn't all a tempest in a teapot. My reading of Smith's original answer was that he was distinguishing between "facts" and "beliefs", where facts are what philosophers call "states of affairs" or "situations": ways the world is (or could be). Facts simply "are", or "hold", or "obtain". Beliefs, on the other hand--as I think Smith used that term--are "propositions" or maybe even "sentences": Descriptions of ways the world is (or could be). Beliefs, understood in this way, can be true or false, rational or irrational. In ordinary, everyday usage, people (other than philosophers) tend to use the word "fact" to mean "belief" or "proposition", but I think Smith was trying to make a distinction that the current questioner is missing.
As for the spirit of the question, sure, some facts are--what shall we say?--unfortunate, sad, etc., but to call them irrational would be a category mistake. But then I'm a philosopher and I tend to split hairs :-)