Politics can be a cynical, nasty game, but it's important that everyone believes that the game's rules matter. For a football (soccer) analogy, Nixon was hoping to get away with an intentional handball or studs-up tackle, while Trump is Suarez biting people, or maybe a pitch invasion by angry ultras. None of them are within the rules and should not be tolerated, but some are not even identifiable as football and are way harder to manage than the others.