Neither of these are moral principles in themselves, they are just aspects of behavior. It is when you apply real moral principles to the acts of clinging/commitment that you have behavior which is either ethical or unethical. This Ph.D's analysis never gets off first base because of a flawed initial premise.
You’re asserting your point from a (rightful) assumption of moral absolutes, that moral right and wrong exist beyond human creation and definition.
If you want to understand his point, (temporarily) suspend that assumption of objective (God defined) morality.