Oh my, there’s quite a barrel-full of assumptions in this question, Wassan — not least the fact that there are a great many famous philosophers either still alive or in living memory. But I shall take the question in the spirit it was intended, which is to wonder about the decline in philosophy as a discipline more broadly.
‘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.