Well, you and I may have a mutual interest of ensuring the weeds growing in our yard don't overtake and spread to one another's gardens, but that's quite different from elevating the nomenclature of collectivity. Mutual interests can be found all throughout the scales of human institution, and that's how common and civil council is to be pursued, a given, but States certainly shouldn't be authoritatively imposing the interests of some at the cost of others, and this also leads us to arguments for federalism, to distill government down to the lowest levels of state, then to district, to enable communities to govern themselves differently from those of their neighbors, say should one decide to increase taxation to fund some perceivable public good in one, without meddling in the affairs of the other.
