The medical profession, by definition, is supposed to do good things for you. It's supposed to make you feel safe. It's supposed to make you well. It's supposed to fix anything that's wrong with you within a clean, healthy, nurturing environment and then send you on your way, enriched, empowered and altogether happier.
And for exactly those reasons it's a brilliant archetype to subvert when you want easy access to drama, horror, or dramatically horrific comedy. A bad or incompetent character is one thing, but a bad or incompetent character with access to invasive medical tools and the license* to use them? Uhurhrrgh.
*License may not be current or legally recognised.