Not just the "I'm a doctor..." mentality, it is characteristic of the whole healthcare system - if you aren't a _____ (fill in the blank with EMT, LPN, RN, PA, PhD, hospital admin) you don't know anything (in their minds).
I wonder if they even had an IT department, or if they did, if it was competent (and not composed of the relative of one of the high end staff members - some kid who "built his own computer so he knows what he is doing").
The ability of the doctor to access and alter network settings indicates that the network wasn't properly configured, whether or not it was a privately owned computer.