[tsol]

I haven't heard any clear motives yet. Some people are saying it's simply a case of someone who was a genius that ended up in a mediocre place in life, leading to to killing. Still that story is so common in America I don't see how it leads to killing innocent children at your alma mater? It makes no sense to me.

But as with many of these situations the truth might not make sense-- sometimes it's simply irrational thinking by someone mentally unwell. It reminds me a bit of the Reiner killings as well, considering there too there's no clear motive except maybe a hypothetical mental break. Truthfully, we might just never have a satisfying answer as to why this tragedy happened.

[GaryBluto]

The most obvious motive seems to be a vendetta against higher education.

[willis936]

Not at all obvious. I'm not sure why HN comments are overlooking that the killer was the same age, from the same country, and studied at the same undergrad university as the MIT professor while starting a graduate degree in the same field. We don't know the exact nature, but it is difficult to believe that these points are not highly involved with the motive.