The science of chemistry is what alchemy always thought it was but failed to be. Chemistry achieves the same ends that alchemy aspired towards, but only to the extent to which reality permits. The truths of chemistry are what accounted for all successful alchemy, without exception. Analogously, the truths of the moral landscape are what accounted for all successful moral philosophy, without variants. Morality has long been maltreated and misused by the misguided. The term alchemy wasn’t worth battling over. That region of the map is diseased with superstition. The sciences gladly relinquished that land without a fight. This time, they won’t be so generous. Morality is the correct term to capture the phenomenon. The war of ideas will be fought on this ground.
You spend over a 1000 words saying that Sam Harris is correct. But at no point do you provide an argument for thinking he's correct. You simply assert it. Over and over.