Jeffrey MacDonald absolutely is a psychopath. As are many of his defenders. Psychopaths just can’t stand to see other psychopaths defeated by normies. It “hurts” them.
Psychopathic surgeons have certain advantages. There’s no “OMG, I’m cutting into another human being” reflex. Their powers of concentration and focus are very high (they don’t have the distractions and ‘soul quandaries’ of full adults due to their arrested development). However you wouldn’t want a psychopathic emergency room surgeon who thought his shift was over and faced missing tee-time at the links. Or a surgeon who was on the hunt for the perfect organ match for that cutie surgeon’s patient.
Further: https://pathwhisperer.info/2011/06/01/this-nonsense-has-got-to-stop-you-cannot-betray-a-nonhuman-human-who-is-trying-to-play-the-interviewer-mcginniss-malcolm-bazelon/, https://pathwhisperer.info/2011/06/27/a-more-nuanced-description-of-the-nonhuman-human/