Well, from a Leftist historian, I think we can make some allowances to reduce some of the shock. ;^)
It is startling to see this type of movement right out in public. These folks are brazen!
Right now with a Marxist holding all the power, they can be. The thing is, when that Marxist loses power and we regain it (assuming we elect people with guts who will DO SOMETHING about it) those idiots will continue, cry foul and try to brazen it out and that just ain’t gonna work.
When held to account, that’s when the masks will come off and the violence will erupt. Assuming something else doesn’t start it (Holder’s race war for instance) first.