I strongly suspect that the brutal, completely pointless hazing of residencies combined with the brutality of med school weeds out many compassionate and normal people. Like residencies are pure psychological torment that serves no legitimate purpose and endangers patients. It was invented by a guy who needed a way to get off the floor so he could inject cocaine and sit out the effects for several hours without anyone wondering where he was. It's stressful and psychologically damaging. And only people who can survive those conditions go on to become doctors.