I don't know what possessed Cho to do what he did, but whether or not anyone understands does not change what happened.
I'm not sure why this tragedy hits me so close as I don't really have a connection to Virginia Tech in any way, but it does. Maybe it is the fact that these kids and teachers are the sort of people that I respect most in this world. Students and teachers alike are people that, on a basic level, seek to find truth and improve the world for others. I'd like to think I'm part of that group as I seem to be an eternal student in some way shape or form. On Monday, however, acts of abhorrent violence destroyed their dreams and the dreams of those who loved them most.
It is simply impossible to understand what happened, but again that does not change the reality that it has come to pass. There really are no words that can make this better for anyone in Blacksburg. I pray that which ever deity your believe in is watching over all of you right now and that they are helping your through these dark, dark times.