[d_k_f]

The state might be comprised of people, but unless everybody is directly involved in the final decision process you'll always have (at least) a principal-agent problem between the people acting as political representatives and everybody else.

[saubeidl]

As you do in most things in life.

Do you grow your own food? Do you refine your own oil? Do you write your own contracts?

I would assume you pick somebody to do those things for you because one human can't do literally everything.