"iatrogenic disorders are (probably) the third leading cause of death in the USA.... same for Western Europe"
Or, turns out that medicine is REALLY hard and in spite of however many advances are made, the human body's complexity is still VERY far beyond being fully understood.
"Turns out that doctors are just as crap at their jobs as the rest of us are at ours..."
Or maybe they're just doing their best in circumstances where, for reasons best known to hospital administrators, you get the most junior doctors doing 30-hour shifts instead of splitting shifts into more reasonable times and having more senior staff on call