Here are a couple quotes from the article. I recommend reading the full article as it isn't long but is succinctly insightful.
I've lost interest in the cracks, chips, holes and broken places in the lives of men like Cho Seung-Hui, the mass murderer of Virginia Tech. The pain, grievances and self-pity of mass killers are only symptoms of the real explanation. Those who do these things share one common trait. They are raging narcissists.
The flamboyant nature of these crimes is like a neon sign pointing to the truth. Charles Whitman playing God in his Texas clock tower, James Huberty spraying lead in a California restaurant, Harris and Klebold in their theatrical trench coats--they're all stars in the cinema of their self-absorbed minds.