Sheep do not resort to violence. A sheep is a very passive animal.

I have never heard of an outlaw motorcyclye gang in the movies being called a herd of sheep as they would ride into a town and terrorize the community. Maybe a pack of wolves but never sheep.

Very likely, Donald Trump is paying some of the "protesters" to disrupt and throw things just so he can say how unruly the "liberals" are. I would not put anything past the unethical Trump campaign.