In a determinate system, every event is causally inevitable.

Causal determinism is, simply put, "the idea that every event is necessitated by antecedent events and conditions together with the laws of nature". This idea extends further to human behaviour, arguing that any action or choice one makes is an inevitable consequence of uncontrollable factors such as genetics and environment.

The Contradiction

Assuming that each individual's actions are causally necessary, concepts such as justice and moral responsibility become difficult to define. In order to justify holding individuals accountable for their actions and the consequent punishment, it is necessary to assume at least some degree of free will. Also, since determinism advocates causality, the punisher would also be following the inevitable path established for them in a determinate system. In this sense, I would argue that moral responsibility resides in human practices and emotions, which persist regardless of metaphysical considerations.