Post-Modernist thinking like this is now the norm at American universities.
Moral relativism, the old standard, still had "moral" in the name. The idea of gray areas' still being based on a black and a white were still part of it.
With post-Moderinism, exhibited by these 2 callers, the very notion of black vs white - right vs wrong - are no longer even acknowledged as existing. The enlightened mind no longer holds such outmoded notions.
And yet, humans have a hard time really living that, don't we?
And so, were you to threaten to kill the baby of one of these callers, you can bet he would object.
Morality is reduced to: do I like it or not?