I will not defend the case against this person, because I think that trump's gouvernement actions are awful. But just to nitpick, it looks like that what is taken against this guy is not that they defend a point of view as "free speech" but that they took offensive actions against free speech by pressuring tech and starting baseless legal actions.

But, in the end justice is there to say if things are free speech or not, so it is really bad spirit to use the visa to take revenge on him.

Also the cynical in me would say that somehow you are still a guest in the country so maybe it is not very legitimate to be a lobbyist group for what you think should be the spirit of the country.

Like if I have a visa in China and there create an offensive lobbying group to force companies to support capitalism and free market...