"Who decides these morals" is begging the question. It presumes that morality is subjective. If it were, it would be meaningless, as you attempt to point out. So instead of using that as a reason to accept the theft, assault, rape, and murder of human beings in the name of the State, perhaps instead use it as motivation to learn whether or not morality even IS subjective.
It is objectively true that theft, assault, rape, and murder are internally consistent. The person engaging in these acts is using their property to deprive another of their property. In other words, the perpetrator is telling you with their very actions that their action is wrong.
RE: Principles and Predictions