Maybe part of medical training should include the difference between stupidity and fallibility then. If you made it to med school, you probably aren't stupid, but you are human.
I'd go with: part of any training for complex tasks. And even to kids in general. There are so many people I met who can't imagine that others make mistakes without any real reasons, which leads to unnecessary conflicts or workplace issues. It just happens - plan for people failing, not for punishing random failures.
Checklists were a new tool that required you to submit that you’re stupid and should depend on inanimate paper to do what you already know.