Who's the genius?

All I can say is who is the genius that came up with the concept of car seats? I was out shopping today and my son Noah decided he did not want to be in the cart or be held, and at his age there's no way I can let him walk around and terrorize the store. So that is the start of my problem, add to it that he is teething, needs to take a nap and the check out clerk took twenty minutes to ring up three people! At the point of screeming, kicking, shoes flying, snotty nose and me trying to check out, all I could think was where is the car seat with the five point restraint?
My son has FINALLY come to grips that there is no way of getting out, and that it's actually enjoyable to ride in the car!