Antisemitism at Harvard and elite universities – how could such smart people be so stupid?

Where did all of the antisemitism on university campuses come from?
Should it be a concern to our community? Can anything be done?
If a student is feeling threatened, when can he take off his Kippah? Tuck Tzitzis in? Remove a Mezuzah from his front door?
What did Chazal mean when they said that it’s a “halacha” that Esav hates Yaakov?
Are there any halachic or hashkafic reasons to counter-protest?