According to Primoratz, why do we treat all human lives, qua human lives, as equally valuable?

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Primoratz argues that if we do not treat all human lives as equally valuable, then we would have to give up the principle of equality of people under the law. This is because a person's worth would then depend on something that is arbitrary or contingent, such as their social status, race, or gender, rather than on their inherent human dignity. This would undermine the idea of a just society where everyone is equal before the law. Therefore, treating all human lives as equally valuable is necessary to maintain the principle of equality of people under the law.

According to Primoratz, Why Do We Treat All Human Lives