JS Mill laid out the ethics system called the harm principle, which essentially claims people should be able to do anything if it doesn't harm anyone. Utilitarianism is a moral philosophy that bases somethings morality on its usefulness to the collective. These two ideals clash because utilitarianism doesn't necessarily protect everyone from being harmed, for example an old person who can't help society may be left to die, because they have no usefulness.
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JS Mill laid out the ethics system called the harm principle, which essentially claims people should be able to do anything if it doesn't harm anyone. Utilitarianism is a moral philosophy that bases somethings morality on its usefulness to the collective. These two ideals clash because utilitarianism doesn't necessarily protect everyone from being harmed, for example an old person who can't help society may be left to die, because they have no usefulness.