The Best Argument For Moral Realism?

A clip of Hilary Putnam giving a "Reductio Ad Rortyan" argument for moral realism (or against moral anti-realism) and then Nathan Nobis provides a similar such argument, a version of a companion in guilt argument. Note, this is a version of an upload from the previous channel of something that I put together awhile ago.
#Philosophy #Epistemology #Ethics