For those of you who believe that we have no free will, why should we have any legal system of laws?

If you believe that we have no free will... no ability to make any choices on our own... then why should we have any system of laws that we must follow? Why should someone be punished for not following a law when they had no ability to choose to follow it? They did not follow the law, but that was all that they could do... Why does it make sense to punish them for that?