The first law of brinkmanship is to never , ever take an untenable issue that you will have no choice but to back down on to the brink in the first place.
He lets his anger, hate and spite drive him so the poor boy can't help himself.
Obama is not just spiteful, he is too incompetent to pull off his game plan.
Never excuse as incompetence what is plainly and aggressively displayed as naked hostility.