Gendler and Nonratioanlity of Alief

One can grant in Professor Tamar Gendler's "Alief and Belief"(Issues in Epistemology, The 22nd World Congress of Philosophy, Seoul, 2008) that the architect of the Grand Canyon Observatory Glass Bridge may believe to be safe walking on the bridge and yet has an alief of trembling sensation.

But suppose that there is the knowledge of the perfect architectural safety for the bridge which consists of propositions p1~pn. Wouldn't it be the case that the more number of propositions p1~pn is somehow known to her in building the bridge to be increasing the less trembling sensation of her alief may take place? If this conjecture is plausible would he still be justified in believing that alief is neither rational nor irratioal?