Jokes aside, here are my thoughts.
For as long as human though exists, there will be liberalism, and conservatism. I consider myself as a moderate with a liberal lean.
Amendment I in the constitution states;
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press, or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
Conservative opinion usually leans toward a more direct and word-by-word interpretation of legal manuscript looking more toward enumerated powers which results in values staying relatively the same.
Liberal opinion usually leans toward more "implied" or "assumed" interpretations of legal manuscripts there for giving more elasticity which results in values changing.
Depending on one's belief, you could interpret the actions of the far-right (alt-right) as perfectly legal and should not have been interfered with (thus being reactionary to the current views of exclusions of free speech enumerated by limitations on the First Amendment's guarantee of free speech and expression as recognized by the United States Supreme Court). Or you could interpret it as violating countless laws which all should be arrested, imprisoned, etc. (thus being radical to current free speech laws). Both of which I have listed are extremes and should not be confused to be the only two views. Any individual could have anything in between (or maybe even greater extremes) depending on many factors.
Due to the severity and intensity of the protests (fighting, hatred, terror, etc.) I think that all actions taken are well within the limitations and exceptions of the free speech right.