We are not even close to being as divided as we were during the Viet Nam era. I was in high school and college in the late '60s and early '70s and what is going on today is far from the animosity I experienced then. As the previous poster noted we had military conscription then and that made a huge difference. That is one reason I do not see the draft returning. While things are not happy right now they were worse then... a LOT worse.
Yeah we don't have race riots or kids getting killed at colleges. This is nothing like the late 60s.