So what's new. I can't remember a Presidency when protests and rancor were not the order of the day.
And before your memory, too. The 1930s were pretty "divided," as were the 1960s/70s too.
When I read some naïve crap, I have to remind myself they simply are ignorant. Ignorant about how pissed off some people were about the draft, the death in Vietnam, etc.
I lived right through the middle of that. Was drafted. Saw riots. Was overseas in uniform, when four were shot by National Guard troops at Kent State.
That is a stage of unrest, we have yet to witness. Those two groups at Berkeley last week, were pretty mild for the most part.
More guys died during stateside training for Vietnam, than have died recently in domestic unrest.