When I was at uni, 2 different grad students murdered someone. It was an R1 institution. Their fields were math and physics. Both of them left quite a trail. Both attempted not to be caught - and there were no cameras on campus in those days.
When I was at uni, one of our most famous psych professors beat up his secretary (and did try to lie about it and reframe the situation). He was not fired. He behaved really stupidly, imo, in the way he handled the whole thing. So did his boss, IMO.
And frankly, as someone who spent my whole life in higher ed, yes, I can believe that students (including grad students) can be quite confused and thoughtless. If you want to use the word "dumb," I suppose you can - but you haven't lived until you've worked for a Nobel Prize winner and find out just how lacking in common sense and ordinary life skills they can be (I was Girl Friday for one of them and attempted to work with another one on a non-profit project). The one for whom I was Girl Friday was so socially inept that he arranged his visits to his offices only on condition that everyone (except for one trusted longterm assistant) cleared out of the whole wing of the building. He was not to be seen. One of my jobs was to organize his week's journal clippings and book chapter photocopies (this was before everything was digital). He clearly enjoyed using the photocopy machine AND the scissors - but there was often very little rhyme or reason to what he was collecting. We then left him notes with questions (as he asked us to do) - and he was often unable to remember or interpret why, in fact, he had that particular item or what it was relevant to. This was not just him - there were other absent-minded prof types as well. He still didn't want to throw anything away.
And then, of course, we have famous cases like that of Dr. Death. He was obviously quite intelligent, but very poor at covering up his malfeasance and criminality.
Anyway, even having an advanced degree does not guarantee a person will be able to execute the perfect crime. One of my interests is in doctors who kill. Here's an interesting article on doctors who became true murderers - and got caught, even before DNA:
When Physicians Go Bad: Doctors Who Killed Their Patients
and here's another:
A physician is a person who is trained in the art of healing. Unfortunately, these ten medical doctors preferred to apply their training and skills to the
listverse.com
I am going to assume that someone who has completed medical school and an entire residency is pretty smart. I don't want to get into academic rankings, but WSU's criminology program is ranked middle of the pack by those who do such rankings. Some of these doctors who kill went to the University of Leeds, which is well-respected (#75 of top ranked global institutions of higher learning). Ranks Tier 1 in most subjects. He killed a bunch of people (and got caught).
I think BK's status as a beginner criminologist is part of the overall interest in this case. He has a past criminal record (expunged, as he was a juvenile). He didn't even make it through the first semester of grad school without getting fired from teaching. He has issues.
IMO.