Back to: Philosophy: Justice & Ethics
Immanuel Kant built the great rival to utilitarianism: deontology, the ethics of duty. For Kant, morality isn’t about outcomes at all; it’s about acting on principles that reason itself can endorse. His central test, the categorical imperative, asks: could the principle behind my action be a universal law that everyone follows? Lying to escape trouble fails instantly, because if everyone lied when convenient, promises and language itself would collapse; the lie only works by free-riding on everyone else’s honesty.
Kant’s second formulation may be his most influential idea: treat humanity, in yourself and others, always as an end, never merely as a means. People are not tools. This is the principle you felt on the footbridge: pushing the man uses him as trolley-stopping equipment. It’s also the philosophical backbone of human rights and human dignity: some things may not be done to a person no matter how much good it would buy.
Practical takeaways: Kant gives you hard floors, lines you won’t cross even under pressure, and those floors are precisely what integrity means in professional life: no fraud ‘for the team,’ no deception ‘for their own good.’ The blind spot is rigidity: Kant notoriously held that you may not lie even to a murderer asking where your friend is hiding, and most people reasonably conclude that duties can conflict and must sometimes be weighed. Use Kant to identify what shouldn’t be for sale; use judgment when duties collide.