Secular humanism in its more radical and moderate forms since the French revolution has always been subject to the direct and straightforward criticism that as a philosophy it will eventually lead to an erosion of a shared reference frame and eventually an erosion of sanity itself.

What if this societal rejection of Truth that we are witnessing (and is summarized well by the article) is the direct result of the success of secular humanism?

I think this is the elephant in the room.