I'll relate a story from personal experience. Years ago, I served on my medical school's committee to select new residents in neurosurgery. One applicant from an Ivy league medical school came with a rather odd recommendation from his dean...it said that during his surgery rotation there he had "almost always acted appropriately." Huh? What does that mean, I thought...he only choked a patient once?
I realized what it meant when I met the man for an interview...he was an uncontrolled schizophrenic. During the interview, he rambled in the classic "flight of ideas" way that schizophrenics do, about how he would cure cancer, how he talked to Jesus routinely, how he received diagnoses by microwave transmissions, etc. Remember, an Ivy league school had made him a doctor and was foisting him off on us as a potential surgicla resident. No doubt afraid of litigation, the only clue they would give anyone was he cryptic phrase in his reference letter.
The takehome message here is that we have become so non-judgemental, so tolerant of aberrant behaviors, so afraid of lawsuits, so afraid of looking "discriminatory", that we have become incapable of telling a psychotic who refuses to take medicine that he can't be a surgeon without doing it in some asinine way like saying he was "almost appropriate" in school.
The question in this case is why was a man who set fires in his room, stalked women on campus, was committed to a psych program, never spoke to his roommates in eight months (they didn't even know he spoke English), never acknowledged his teachers in class (in fact, often never went to class), wrote clearly psychotic poems in class, had one English teacher threaten to quit rather than teach him...why was he still in school, or better yet, how did he even get in? I doubt his performance in high school was nay better.
This isn't a gun issue, it's an issue of our pathetic approach to mental health issues.
If, instead of writing disturbing emails to women or torching his room, he had only lived off campus and hired a stripper...