[pvn]

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I don't understand what I have to agree or disagree on. That all people should be treated equally?

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Sort of, but it wouldn't be limited to just that. In a system that is both consistent and has only one class of people, actions that are morally permissible for any one person must be morally permissible for all (good for one, good for all) and actions that are impermissible for one must be impermissible for all. If it is bad for me to point a gun at you and demand your money, it must be bad for anyone to do that.