The right to free speech is the right to not have the government infringe on your free speech. I will earnestly defend the right of you (and me) to be free from government repression.

However, FT is a private operation. It is free to silence or ostracize those interfering with its goals. We'd be insular and foolish to do this wantonly, but the civility and high information content of FT is one of its sparkling charms.