Because essentials always need to be available to people, even at the cost of efficiency. The article addresses why essentials are a special case.
"If the just-in-time system for producing cars runs into a hitch and the supply of cars shrinks for a while, people can easily adapt. When the same happens with food, people go hungry or even starve."
So "essentials" -- which, of course, are defined as things that are essential -- must be controlled by the horribly inefficient and incompetent government, instead of being provided by people with a vested interest in their provision. And this is true, because essentials "always need to be available". Yours is an argumentative wheel of Swiss cheese: completely circular, yet full of holes.
"If the just-in-time system for producing cars runs into a hitch and the supply of cars shrinks for a while, people can easily adapt. When the same happens with food, people go hungry or even starve."