Argument from Conscience

[Mister Agenda]

I say that if the conscience has no moral authority that presents a serious problem for anyone trying to defend their right to make any kind of moral judgement.

Chad, Yes!  That is exactly the point!  If there is no transcendent point of moral authority, then morals are completely relative then there is no "evil" and everyone loses their right to pass judgment on anything.  They may have an opinion, but that cannot logically condemn it without assuming moral superiority.

We don't have an absolute standard for height, and we don't need one to say which of two people is taller. Not having an absolute standard absolutely does not mean you can't compare the morality of two things, relative to each other.