I won't pollute my K701s with the sound coming from those videos, so I haven't seen them.
I have not made a commentary on any other website about these events, nor any other commentary here because I haven't felt the urge to. However, I think to regard him as "mentally dumb" or as some kind of an invalid is remarkably immature. I don't know enough about him to make any sort of conclusion other than that he was a deeply troubled person, whether caused by himself or others I could not possibly say. I can say that there is no excuse for his course of action, and for him to assume that everyone is happy but himself is a clear sign that he should've sought mental help, or had it forced upon him. I do hold the university somewhat responsible, because it's becoming clear that they had knowledge that he was if nothing else an extremely depressed and disturbed person, and with that knowledge they are responsible to help him, and ensure that he is not a danger to himself or others. With that said, there is no one to blame here but Cho himself, what he did was cowardly and disgusting to the utmost. But it does prove that society has clearly not learned its lesson from previous similar events; that there are always warning signs which should not be ignored. I can only hope this inspires people to care more for those around them, and to have a greater knowledge of their surroundings, so that a person who is so deeply disturbed and violently inclined cannot slip through the cracks long enough to commit such an unbelievably vile and heinous act upon innocent people.
That said, I strongly feel that the attention of the nation should be more towards positive thinking about the future of the campus, and the victims and their families. To focus on the negativity of the act, and the man who committed it is an injustice to their pain. This should be a period of mourning for those who were lost, and remembrance of heroes such as Liviu Librescu. What I've taken away from these horrible events is a complete lack of understanding. I don't understand how someone can be so selfish that in their own misery they can inflict such pain on others, but not having been there I cannot truly expect to. I also cannot understand how someone can be so truly selfless as to knowingly sacrifice themselves to potentially save others. I'd love to say that I would do the same, but I also hope that I'm never in a circumstance where I really have to find out if I have it in me.
My thoughts and prayers go out to everyone at VT, as an engineering student at CU I've been trying to imagine my reaction to such an event on my campus, and I cannot even begin to fathom the struggles which lie ahead for everyone at VT.