Developing systems of morality, outside of religious influence.

[robvalue]

Saying that we shouldn't punish people if we don't have free will commits the stolen concept fallacy. If we don't have free will, then neither do the people doing the judging. They can't "choose" to depart from their method of judging any more than those committing crimes can "choose" not to do so.

We're so used to the idea of choice that we continue to use its language, even when supposing we don't have it.

Even putting that aside, the argument fails because punishment is (hopefully) secondary to protecting society, so it's still important to put people in prison if they murder people, and so on.