People have conflicting wants. I want to live in the nice riverside plot, so do other people. I want the streets to be brick, other people want cobblestone. I want the town square to be a green space, other people want it to be a playground.

Sometimes different parts of the community want mutually exclusive things. All of political and economic theory ultimately comes down to how to negotiate disagreements about how to do things. You’re not going to get unanimous consent on anything of substance in a group of more than a dozen people or so.