Extend the sphere, and you take in a greater variety of parties and interests; you make it less probable that a majority of the whole will have a common motive to invade the rights of other citizens;
Let’s make the bubble bigger and diversify it in terms of parties and interests. (versus just the rich landowners with their specific motives that do not further the public good) In this situation there will be less oppression because all interests will be represented.
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