Hi, here comes another question about feminism and philosophy and feminist

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Read another response about Education, Feminism
Hi, here comes another question about feminism and philosophy and feminist philosophers. I am 30 years old and was a student of philosophy in Germany for 6 years before graduating to Master of Arts. Recently I read a book about 19th century's feminists and stumbled over a small notice concerning John St. Mill's "Subjection of Women". Although I would describe myself as a quite diligent student of philosophy (even in high-school) and also very interested in feminist topics, I never knew about this well known philosopher being a feminist as well. Now I ask myself three questions and hope you can help: 1) How can it be explained that even at university level the discussion of a classic philosopher like Mill never touches the bad F-word (i.e., feminism)? And who is to blame? 2) If even students of philosophy do not touch these topics if not accidentally altough it should be their genuine field of activity, how will other people, to whom the matter is quite distant, ever find out? 3) How many other important thinkers have written to this topic and I never found out? Thanks for your opinions.