Anyone with the audacity to laugh at him for this should rot. To commit something of this degree, he would have to of had numerous problems with his life, inside and out.
I'm not defending him or what he tried to do, but at the very core, we're all human. Take a second to imagine what kind of issues you would need to have to even think about attempting a mass killing. I bet most of you can't even fathom it. I know I can't. Nevertheless, he must of been going through something terrible, and while I'm not calling for forgiveness, none of us have the right to blatantly mock him.