....Actually, digging deeper, it seems Cho was evaluated and diagnosed with autism:
Virginia Tech gunman Seung-hui Cho was diagnosed with autism after the family emigrated to the United States, a relative in South Korea says.
"From the beginning, he wouldn't answer me," Kim Yang-soon, Cho's great aunt, said in an interview Thursday. He "didn't talk. Normally sons and mothers talk. There was none of that for them. He was very cold".
"When they went to the United States, they told them it was autism," said Kim, 85, adding that the family had constant worries about Cho.
http://www.theage.com.au/news/world/cho-was-autistic-family/2007/04/21/1176697133222.html
Cho's autism has not been mentioned much in the US media because the autistic community went ballistic -- intimidating the media - at any suggestion that autism caused the killings at Virginia Tech.
CNN broadcast the autism connection and quickly withdrew it from its website after complaints from activists. The AP story that mentioned the link was highlighted in papers around the world, but not mentioned in any US headlines.
http://www.huffingtonpost.com/blake-fleetwood/high-functioning-autism-_b_46609.html