It’s not that the left doesn’t “get” that - they actively REJECT that.
It inhibits their power over their fellow human being.
The trouble with claiming that the American bill of rights is just a list of divine rights... is that it isn’t entirely that. Some of it really IS positivism.
Well, it’s probably a combination of both, but the deliberate or negligent lack of educating our young in their formative years about the subtitles and understanding of the Bible, the Declaration of Independence, and the Constitution has lead many to be simply ignorant and uninformed about the true Source of our rights and freedoms. And the Left counts on that.