Imagine the mental fortitude necessary to be a "life and death" doctor as I put it (also includes ophthalmologists since loss of eyesight is a very bad thing), knowing that some of your patients will inevitably die, and that sooner or later you're going to make a mistake that will kill one.
Everybody dies... Everybody makes mistakes... It's all just a matter of delaying the inevitable. Worst case, you fail to delay it at all (or maybe hasten it a bit).
