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In any profession most practitioners are bad at what they do. There's nothing magical about medicine that exempts that profession from this rule. If your mechanic can forget to refill the oil in your engine there's no reason to believe that your surgeon won't leave a knife in your abdomen. There will be by necessity bottom-tier doctors and the checklist helps bottom-tier doctors stop killing people.

Not just bottom tier... humans are very good at making simple mistakes. It's one of the things we do best. A lot of times the people who are rated as "good" or "great" are rated that way because the make fewer mistakes, not because of perfection.

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