There are many reasons not to read a book. One, because you don’t want to. Two, because you started reading, crawled to page 17, and gave up. Three, because the idea of reading never crosses your mind.
‘Why do different cultures respond differently to depression?’ The question is typical of Matthew. The assumption embedded in it creates rhetorical tension, pulling you on to his intellectual territory, forcing you to take a position. At the same time, it sounds like the beginning of a joke.