Generally agree with you, although I ve been involved with murderous or attempted murderous doctors, so that part doesn't work (and yes, they took their version of the Oath - there's a history of doctors not obeying it and doctors becoming criminals). Dr Death comes to mind but also:
pmc.ncbi.nlm.nih.gov
I agree he's likely not a doctor - but it did cross my mind after reading doctors' responses and comments to this event.
Doctors do commit homicide, just saying. Jeffrey McDonald comes to mind. There are many others. Including medical students.
They may not succeed in their murders, but they can attempt them.
IMO.