I support the right of everyone to march. And, in the US, there is nothing to argue about. This is simply a legal fact... we have a Bill of Rights and a Supreme Court. The right of freedom of speech has been long settled.
You are making the same argument that Trump Supporters make about Islamic Terrorists. You accuse me of supporting Nazis. Trump Supporters accuse me of supporting the beheadings under ISIS because I oppose the Moslem ban and support the freedom of religion.
I believe in Freedom of Speech. Under the US, Free Speech is strongly protected under the first amendment for everyone. Deal with it.