Just because something is arbitrary doesn't make it worthless. Also, morality is a uniquely personal and logical decision, meaning that by definition it can never be arbitrary.

Syme is completely right on this, and I have no idea why people continue to argue with him. Nothing is inherently right and nothing is inherently wrong. Everything falls into our moral compass where it does solely because we have decided it does, not because it deserves to. There is no objective morality, partially because if there was then it would be a universally accepted, and there isn't a single moral decision that is, and partially because morality is an abstract concept. It is like trying to argue time, you can't because it is a purely human concept.