Yeah, we shake our heads at the senselessness of suicide bombers in the ME and yet we have countless equally senseless deaths such as these right at home. There is a slight difference in the politicization of the bombers but I can really only assume that they are also simply madmen (and women) like this guy. Somebody--with a gun--always thinks he has a better way, huh?
Also consider some of these crazy people do it to sadly become famous. The more the media report on it the bigger their fame. It's a sick way of become famous but that's the culture we live in. This won't be the last time it happens and yet will anything change because of this incident? It will be a footnote in history and the world moves on. For the people that lost loved ones their world we be shaken forever.