Sex and violence

Although I have seen and read a lot about the murders carried out at Virginia Tech by the deranged Korean student, Cho Seung-Hui, I have not seen the most likely reason for his actions highlighted. Without beating about the bush and calling a spade a spade, the most likely explanation for his actions was sexual frustration.
It is noteworthy that most shooting sprees in schools and colleges are carried out by young men in their mid to late years of puberty. Cho was 23 years old, but apparently had little or no contact with other people, including the opposite sex. He was a loner, but it is noteworthy that in the previous two years he had been reported to the police twice for stalking young women. And these young women, from the photos published, were very attractive and unlikely to want to have a relationship with Cho. Also, the first act of murder that he committed was to shoot a very attractive young woman in a neighboring dorm room to his own. Although police have not so far reported any contact between Cho and this woman, the fact that he chose her is striking.
There is evidence that Cho was mentally disturbed, and that he was ruled as mentally disturbed by a judge after the second of the stalking incidents. He was then taken to a mental health center by the police where he voluntarily admitted himself for 2 days. But, his mental health record was private, and it was not officially known to either the University or to the State authority that controls the purchase of guns. Obviously this is a loophole in the law that needs to be filled. If a person has a record of mental disturbance and has received treatment for it, this must be taken into account in the decision to allow that person to function in a university environment and to purchase a gun.
Cho's English teacher, Nikki Giovanni, was so upset by Cho's behavior and writings that she threatened to resign if he was not removed from her class. This is strong evidence that he was disturbed, since very few teachers would threaten to resign over a student. His writing was full of sexual violence and pornographic images that are unacceptable in a normal educational context. Some have made the connection between Cho's behavior and Giovanni's well known anti-establishment and liberal views. But, the fact is that other of her pupils have not become multiple killers, and in this case the evidence is clear that the motivation came from within Cho and not purely from outside. But, even though he was Korean, Cho chose women who represented the ideal of European beauty, this being the cultural norm in the US where he grew up. There is no evidence published that he either chose Korean or Asian girls, or that he frequented prostitutes.
Young men with high levels of testosterone develop in parallel both the need for sexual gratification and high levels of aggression. This is why they are so attracted to violent computer games, as well as to young women. But, men who are chasing an ideal woman that is beyond their reach usually up end being sexually frustrated. Most young men eventually find a way to make civilized contact with young women and then mature. Those who cannot and remain frustrated manifest their sexual frustration as increased aggression. In rare cases, this frustration and loneliness turns to fantasy and then acting out the fantasy of "getting even" with the perceived causes of the condition, both young women and competing males. I am not a psychiatrist, but I can speculate on the causes and origins of such an extreme, but not unique, case of mass murder.