Now, we may be home to some of the brightest minds in the nation. Unfortunately, their expertise in their chosen academic field does not necessarily make them an expert in dealing with such mundane matters as emails purporting to be from their IT department. Some users simply see that there's some problem, some action is required, carry it out, and go back to considering important matters such as the mass of the Higgs Boson, or the importance of the March Hare to the Aztecs.
Please read the above paragraph again. It seems to me that it contains all the information you should need to understand the motivations of the University of Oxford's computing service in this matter. (It also bears a more than passing resemblance to the sort of thing those of my friends who have worked as I.T. staff at the University of Cambridge and its several departments and colleges would say.)
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