Are we merely puppets of physics or the architects of our own destiny?
In short: If every event is caused by a prior one, is true freedom even possible? Metaphysical libertarianism argues that we are not just links in a causal chain, but agents capable of initiating new paths through the power of choice.
Metaphysical libertarianism is an incompatibilist position: it holds that free will and determinism cannot coexist. If the universe is deterministic, there is only one possible future. Libertarians, however, argue that for free will to exist, an agent must be able to choose between multiple possible courses of action under the same circumstances. This perspective is fundamentally at odds with determinism, as the existence of true agency would render a deterministic universe false. This view is a specific subset of the broader incompatibilist school of thought.
Philosophers have proposed various mechanisms for this freedom. Some, like the 'agent causation' theorists including George Berkeley and Thomas Reid, suggest that humans act as 'unmoved movers,' initiating actions that are not caused by prior events. Others look to physical indeterminism, such as the random behavior of subcritical particles, to provide the 'elbow room' necessary for choice. Even the ancient Epicurean philosopher Epicurus suggested that atoms might 'swerve' from their paths, breaking the chain of necessity. This concept of the 'swerve' was also observed by the philosopher Lucretius in the 1st century BC. Some modern physicalist models even suggest that quantum indeterminacy might allow mental processes to map onto subatomic randomness.
Modern theories attempt to bridge the gap between randomness and responsibility. Robert Kane, for instance, proposes 'ultimate responsibility,' where indeterminism acts as an obstacle or resistance within the will that must be overcome by effort. Similarly, Robert Nozick described a process of 'weighting' reasons, where a person's decision reduces a superposition of possibilities into a single, self-constitutive action. While these models attempt to preserve agency, critics like William James warned that if an act is purely random or 'ex nihilo,' it becomes difficult to hold the agent responsible for the outcome. In his 1981 work, Robert Nozick compared this decision-making process to the way a quantum wave packet collapses during observation. This framework relies on the idea that we are the original creators of our own purposes.
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- Summary by Intellect · source: Libertarianism (metaphysics)
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