Is the real world fair and just? So I'd like to try to add some nuance to my argument.
If determinism is true, there can still be morality in that we can consider an action right or wrong. Further, we can still give moral reasons in a determined setting.
However, it seems that it would be wrong to hold anyone morally accountable in a deterministic universe (since all actions are not in the control of, or caused by, the actor). Then, in a deterministic universe, we would find ourselves in a situation where certain actions are wrong but where it would be unjust to do anything about those wrong actions.
But if I do hold someone morally accountable, am I myself morally accountable or not?
I guess I think morality breaks down and is incoherent within a deterministic world in a way that it does not if we take ourselves to have free will.
To Gnomon's original question - in a deterministic universe, if a wrong act is committed, then the world is thoroughly unjust
because any attempt to punish is itself unjust.