I believe I remember Evans saying that in a morally relativistic world, where anything is allowable, then there can be no moral judgments. And if there are no moral judgments, then Nazism is as good, as a liberal democracy, or a Representative Republic. This is the basis of the "rule of law". It protects us from depotism.
That is not to say that those that live in free societies have vastly different understandings of and to their commitments. That is what liberty means.