Their version of justification is to parade the naturalness of its normativity, usually grounding its authority in some metaphysical masterpiece of moral Truth. You see, Communication, the kind that kills classical moralities dead, is not just neutral report. It is a complex hodge-podge of fact and value, tension and relief, and contrast and comparsion. It can bridge the islands of diverse value-systems most often by altering both. Classical morality is not interested in its reform, only in its enforcement.
Communication simply gets things done.
The unknown is welcomely colonized and communicated, since it promises new forms of human happiness. Unfortunately, it is mostly the domain of thinkers. And Common Sense is still anchored in the ugly legalism of classical morality. That s just wrongheaded, boy. If your justifications are not deferred to Nature, God, or Law, then you have probably been slurred as a nihilist.