That way government more closely follows the will of the people when people have geographically non-uniform distribution of what they want in government. For e

That way government more closely follows the will of the people when people have geographically non-uniform distribution of what they want in government. For example, if 60% of Maryland wants children to be banned from playing outside while 40% of Pennsylvania does, it more closely matches the will of the people if Maryland bans it and Pennsylvania doesn't, instead of having the feds ban it or ban states from banning it. Not that "will of the people" democratic mysticism is a good justification for anything.