There is no point to the search for truth if a political community must remain morally relative toward it. Devolution of the public square into vile ventilation seems inevitable when truth is only the province of individuals and not the community. A morally confident society—one possessing faith in its first principles—can see a principled distinction between restricting the expression of armed neo-Nazis looking for violence, on the one hand, and truth-seeking, on the other. In contrast, a society that cannot regulate damaging attacks on the public square calls into question the viability of all liberal principles.
William J. Haun, The Natural Law of Free Speech