But what about seoi nage? Kids learn that in Japan from kindergarten age and it seems to leave the head and neck in greater danger than the type of kubinage they show.
The difference is seoi nage uses the arm not the neck. There's the possibility of injury in the beginning of the throw just as much as the landing of the throw. A yanked shoulder can be a serious injury but it's never lethal, a yanked neck especially if it's disconnected from uke's center can paralyze or be lethal.