He lost his TA position after an "altercation" with his professor, who was the grad advisor for the program. He is a man and a well known criminal attorney. A criminal defense attorney.
crmj.wsu.edu
That's the person who went to higher ups in the university and IIRC, is the one who delivered the news about the discontinuance of the TA position to the soon-to-be-expelled student.
So he had trouble with at least one man. We also do not know the gender of every student who might have complained about him (supposedly he went from grading harshly to giving everyone in the class an "A" on every assignment after some students complained).
The woman who supervised his master's thesis wrote glowing things about him, though and Katherine Ramsland also thought he was a fine student and very intelligent.
The person mentioned as "L" in the documents says that he approached his women students "inappropriately" (as in wanted relationships with them, is how I took it). He certainly had problems getting close to women in appropriate ways. "L" was apparently a friend or acquaintance of his.
Totally agree that he was socially isolated and obviously very angry. We use the word "human" in several different senses, a topic of much discussion in philosophy and anthropology. When I say "Person" I mean an entity that is capable of consciousness, rationality and moral reasoning. The word "human" is more complicated, but when I say he is not "human" I mean that he does not exhibit the best features of our species (I'm using it in a way similar to the root of the word "humanity.")
Biologically, he is of course human and deserves the same treatment as other humans get when they have acted as he has. In this case, Idaho has decided to sentence him to life in prison, which I think is just. I also agree with those who are saying he might be relieved to be permanently locked up.