What you say is true but the nature of technology has resulted in humans needing to operate in larger and larger groups to optimise the potential wealth and security that can result from being in a group.
The family while still biologically and emotionally valid is no longer a potent economic unit.
It was when farming was done by a family and farming was the most common occupation.
That world no longer exists in the developed world.
The nation state, and its collective capacity to build security and economic scale, like it or hate it is more important to the wealth of people than ever before.
And most people want wealth . . . as much as they can get.