Nope, not arbitrarily. Statements of fact about the physical world that can be objectively observed and tested- empirical facts- have an objective reality. Questions of values are different, they appear to be relative. While there might be some absolute standard for them somewhere, I've seen no compelling evidence for it.
For example, the statement that a baseball bat swung at high velocity at your head will, if it connects solidly, cause you extreme discomfort is a statement of empirical fact. It can be tested, observed, and, by objective standards, be determined to be more likely true or false. It need not be 100% certainty. Just because everyone known to have been hit in the head by a baseball bat has been known to suffer some detriment from it doesn't mean that the bat won't pass right through the next guy's head without causing any harm. but it's likely that the next guy's gonna have a headache.
That's an example of absolute, or objective, fact.
Next take the statement that baseball is better than football. Now I can muster arguments for both sides based on a number of different values. But ultimately this is a subjective matter of opinion and no evidence would change opinions about which you think is better into a statement of absolute fact.
Moral values work, to all appearances, like other value judgments- they aren't absolute, they are subjective and relative. Can I prove this absolutely? No. Have I seen any evidence to lead me to believe otherwise? No.
It might sound judgmental to some to say that a baseball bat is hard enough to cause a skull problems. But the judgment's based on empirical facts. It might sound judgmental to say that someone who thinks football is better than baseball is deluded or lying. It is so and without good reason. Absolutist statements about subjective things don't strike me as being very rational.