I forgot to mention that in addition to Vietnam, the Draft etc.,in the 68 demonstrations they had recently experienced the assassinations of MLK and RFK. Brokaw wrote a book on that period which is worth reading.
Bill Ayers was part of it. Might have trained some of them. [Weather Underground.]
Protesters smashed car windows, blocked ambulances, flipped people off, wore obscene tee-shirts, shouted vulgarities, antagonized people [such as by knocking hats off of heads], and worse.
Children were present.