It is said that; “the moral law is not always the standard by which we treat others, but it is nearly always the standard by which we expect others to treat us.”
Human rights are not grounded in opinion, they are grounded in a common higher authority. That is how organizations like Amnesty International, or the International Justice Mission function; they rely upon a common good that is grounded in a Higher Authority whether they realize it, or admit it, or not.
This is closely related to the argument from evil where the atheist claims that the existence of evil in the world proves that there is no God. However evil in the world does not disprove God, but it confirms that men instinctively know what evil is because they also know what good is.

