The violence is not acceptable, and is already being seized upon by the right-wingers as “proof” of the evil of ALL the many protests taking place, most of which (Women’s March, last weekend’s Rally against the Muslim Ban) were completely without violence.
This violence does not represent me, my views, or liberals in general. Indeed, it may have been provoked by agents provocateur of the Right. (Isn’t that what they always say about violent right-wing riots?)
The classic formulation is: “Your right to swing your fist ends where it meets my face.”