US college Massacre : Killer was South Korean student

I was utterly disgusted and shocked by the South Korean's act when I first read the article. How could one ever resort to massive killing to people he did not even know simply because of his hatred?
I feel that the act of the South Korean was equivalent to that of terrorism, leading to the deaths of at count 34. I think that the school should be partly blamed for this incident to happen because they failed to take precautions against this mentally unstable person. Even though violence was shown in his play scripts, the school did not follow him closely to monitor him psychologically and therefore failed to take any action to stop this tragedy. This is supported by an article, stating that the universities officials did not act fast enough to warn students of an unfolding tragedy that grew as details surfaced about the shootings.
In actual fact, I pity this killer as he may be suffering from mental illness, therefore contributing to the weird personality he had. The shock that was beyond description over the fact that the tragic incident was caused by the South Korean native who has permanent residency shown on President Roh Moo-Hyun proves that one would never expect a student to do such a thing. Also, being an introvert who did not have many friends and is isolated in his own world, he got bullied in school most of the time and therefore I think this may be the cause to his sadistic behaviour.Other factors such as the failure to notice the hatred that was slowly built on in him by his parents also caused this sorrowful incident to happen. I feel that his parents should also be responsible for his behaviour because they may have neglected him, which in turn allowed him to think and do whatever he liked.
In conclusion, I feel that this incident would cause much shivers, and that it will somehow affect the number of people going abroad to study as parents fear that the same plight of dying in the hands of a massive killer would happen to their children.