The consequences of being wrong in the comments section is significantly less, imho. Plus, doctors are paid a lot for their expertise. It's really not about craving certainty. It's a question of a system that disincentivizes thinking through a problem that doesn't slot well into the diagnostic framework taught in medical schools to students selected for their ability to think inside the box, with little requirement, or really, possibility, to be very deep in biochemistry, pharmacology, research science, or a host of other inputs. Oh, and they're often very arrogant.