In the political context fair means somebody that will vote for the unions or for the business. It can't mean that in the judicial context or we're in real trouble.
The First Amendment is often inconvenient. But that is beside the point. Inconvenience does not absolve the government of its obligation to tolerate speech.
The remedy for speech that is false is speech that is true. This is the ordinary course in a free society. The response to the unreasoned is the rational; to the uninformed, the enlightened; to the straight-out lie, the simple truth.
As the Constitution endures, persons in every generation can invoke its principles in their own search for greater freedom.