What was the most likely reason that Allied leaders did not completely believe or understand the full ramifications of the "Final Solution" when they first heard about it?

They did not believe that someone could do something so horrible.

john smith was the first englishman to sail around the world. francis bacon served as attorney general and lord chancellor of england. he took up aristotelian ideas, arguing for an empirical, inductive approach, known as the scientific method, which is the foundation of modern scientific inquiry.