What then? Would you feel bad for him? No, I don't suppose you would. Since he just murdered an entire classroom. But what about before that? Would you of cared? The proper answer is Yes, you would.
Lets say, for example, he was also getting abused at home. Every night he gets home from school, he walks in to find his mother on drugs again, and his father just waiting for a moment to beat him senseless and/or rape him.
This goes on constantly for days, weeks, years even. During that time, he'd of learnt to think differently. Thinking of ways to murder his family, or commit suicide.
Lets say he went to the Library one day at school, and found a book on past School Massacres. He gets it into his head that this is the only way he can be noticed, and without a second thought, grabs his fathers/grand-fathers gun, goes to school, and kills everybody in the room before attempting to kill himself.
Of course, after it happens, nobody gives a ****. But what about before-hand? Would you have done something? If your answer is no, you have no right to mourn for the lost.
If your answer is yes, then why aren't you mourning for the loss of the one who caused it?
There are many circumstances as to why people do things. I, for one, have wanted to commit several dozen acts which would land me dead, or worse.
So next time, before you jump to the Mourning stage, after something like this happens, give a really big thought as to WHY it happened.
Information is the greatest weapon in battle. Without it, we are doomed to failure. ~Unknown