It's so interesting to me that CV's coworker at Sapo described him as a "sweetheart" and "extraordinarily approachable", and how that doesn't align with the descriptions from his university peers. Why was CV so unpleasant at Brown and his undergrad, yet so "approachable" when he was at Sapo? It seems like many accounts from people who knew CV in academia describe him as egotistical or narcissistic, and I can’t help but wonder how much of that assessment is notable only in retrospect.
I'm thinking back to my own doctoral program, and if LE had questioned me about a quarter of my cohort, I probably would have offered similar descriptions. This seems glib, but narcissism and superiority complexes can run rampant in certain graduate programs, and in some ways they’re culturally reinforced. Many students are accustomed to being the biggest fish in the pond, and when they're in a tank with other big fish that can foster intense competition that can become bitter and uncomfortable, with many seeking to 'prove their worth'. Some spent every waking hour researching, attending department events, or working TA positions.. and their sense of self became tightly interwoven with their academic standing. Any academic setback—minor or even simply perceived—was treated as personal and a sort of injustice done of them. It wasn't even necessarily a cut-throat environment but rather the outcome of a grouping together folks predisposed toward competition—people used to being the smartest person in the room, all vying for a pathway to get a rare TT position at some point in the distant future.
However, none of my former classmates went on to kill anyone; and obviously this culture doesn't organically spring up in every department at every university. But, I think this is all to say that I'm not entirely convinced that CV's egotism and disdain presented a significant barrier to his success in academia - I don't think it's an uncommon set of traits - and there's very likely more to it than that. Whatever it was presented itself while he was studying, but apparently not when he was working in IT.
I think it's entirely possible that CV lived an average, stable life outside of academia before something set him off (perhaps Prof. Loureiro's promotion or presidential award?)