OK, I'm going to tell you my theory about mass or serial murderers. I've noticed a pattern; every single one of them drank water from the time they were children! They also spent a significant number of hours sleeping, walking and sitting! And without exception, every single one of them ate food!
What I'm trying to say is that we cannot draw any conclusions until we have MORE information, and we just might not get any more. Yes, he was young, male, Asian, maybe an Aspie, sexually frustrated, a loner, angry, but we cannot conclude that those things caused him to do what he did. Many people share one or all of these qualities/descriptions, but they don't commit mayhem. This guy had something very wrong in his machinery, and we don't know if it was a design flaw (congenital), some experience (abuse, perhaps), or some pathology (brain tumor, drugs/medication, whatever). We only know it resulted in incredible tragedy.
As an aside, my best friend is Korean, and she says that many, many of the Koreans here in the U.S. are very concerned about a backlash. Since she watches Korean TV and listens to Korean radio, I have to believe her. I'm sorry to hear that they are so worried.
Also, I worked as the only American in a Korean company for a few years, and looking directly into the eyes of a stranger or a superior (boss, teacher, person older than you) is considered rude. But it is certainly acceptable to do so with your peers!
One more point; as an Irish-American married to a Taiwanese (Chinese) man, I notice inter-racial couples. I live in California, and it is common to see Asian women with Caucasian men. But it much less common to see Asian men with Caucasian women. I would like to think it's because the men feel the need to carry on the family traditions and need an Asian wife to do so. But I'm afraid there is a stereotype that women will have to be subservient to an Asian husband (wildly inaccurate in my case!).
As for fears that the NT world will backlash against Aspies, I do think we're getting too worried about it. I agree that most NT's think of Aspies as tactless and maybe a little nerdy, but not as violent killers.