You'd have a heck of a time proving intent on a case by case basis, and you'd have to make a case for it in order to eject someone or fine them. I too saw the play as it happened, and as bad as it was, it never crossed my mind that it was intentional.
None of those guys truly want to hurt anyone, and there are a variety of plays that can end in horrific injury. Injury or not, you can't eject someone for an accident.