Causal determinism, the idea that the future is predetermined by natural law, works hand in hand with the principle of cause and effect: every event in the universe has a cause, and if we trace it back far enough, the event can be predicted by its prior causes. Therefore, we can track every past event to the event that preceded it, and also predict (in theory) the event that will follow. The sheer predictability of the universe might seem to render humans devoid of any free will, or chance to make decisions for themselves. But can this theory be rebutted?
One possible response is compatibilism. This theory creates a harmony in which the concept of free will and the principle of cause and effect can coexist. Compatibilism accepts that, due to natural law, complete regulative control is impossible, but argues that free will can still exist in a meaningful sense. Certain choices can still be made by humans, guided by their likes, dislikes, preferences, and selections. Ultimately, there is always a choice within limited circumstances, leading to millions of alternate possibilities inside a small spectrum of likelihoods.
Additionally, having free will holds humans morally accountable for their actions, forcing us to think about the consequences we may face if a crime is performed. This leads to a third position: libertarianism. This is the complete rejection of determinism. It conveys the idea that humans have genuine control over their own actions, and if those actions do not infringe upon others, they are freely chosen. Linking back to accountability, libertarianism stresses that a person could have chosen differently but committed to a specific action — and so can be judged for it. This rests on the Principle of Alternate Possibilities, which claims that we can only praise or blame someone if they really could have done otherwise. As libertarian thinkers argue, humans must take responsibility for the choices they make in their lifetime.
Libertarianism and determinism therefore appear as two ends of a wide-berthed philosophical spectrum of thought concerning the existence of free will and moral responsibility. Compatibilism, however, positions itself in the middle. Compatibilists argue that external coercions do not matter so much as whether the person acted in line with their own desires and intentions. In 1969, Frankfurt’s thought experiment challenged the idea that free will requires genuine alternatives. It depicted a man faced with two options: A or B. Unknown to him, circumstances ensure that he must end up choosing A regardless. The man still chooses A of his own accord, and so he remains responsible — even though he could not have done otherwise. This shows that one’s own will is central to responsibility.
But then there is the question of punishment. Libertarianism and compatibilism both allow for consequences and accountability. Determinism, however, presents difficulties. If natural law causes every event to unfold necessarily, and nobody can change what is fated, then should criminals really be punished if they were always destined to commit crimes? The three main aims of punishment are retribution, reformation, and deterrence. But for hard determinists, because humans are not truly accountable for their predetermined actions, retribution — the idea of “an eye for an eye” — is out of the question. Instead, punishment can only be justified in forward-looking ways: reformation, to improve behaviour, and deterrence, to prevent future crimes. In this respect, determinism aligns with aspects of the modern world, where punishment is often framed not just as payback, but as a way to improve society and ensure a safer future for all.
Ultimately, the tension between determinism, compatibilism, and libertarianism remains unresolved. Determinism reminds us of the power of natural law, compatibilism offers a practical middle ground, and libertarianism protects our deep sense of freedom. Yet each view faces challenges: determinism undermines responsibility, compatibilism risks redefining freedom too narrowly, and libertarianism struggles to explain how free will escapes causation. Whether humans are truly free or not may never be decisively answered, but the debate remains central to how we think about justice, morality, and what it means to live responsibly.
In conclusion, free will affects not only ourselves but also those around us. It lies in the small choices we make each day, choices that can shape a better existence for others and allow humanity to live in a form of harmony — though this remains more an aspiration than a reality.