Who is responsible for the Columbine massacre?

The personalities of Dylan Klebold and Eric Harris allowed the Columbine tragedy occur. Without a Harris, Klebold was a typical underachieving, depressed teen who hated and blamed himself more than he hated or blamed others. Without Klebold, Harris was a psychopath who would have eventually, on his own, wreaked havoc on the world he hated and the stupid, worthless people who inhabited it; he enjoyed hating, he enjoyed demeaning, and he enjoyed the idea of inflicting pain and suffering on others. Harris was also an adept liar. His friends and classmates reported that he lied about anything and everything. He enjoyed lying as much as he enjoyed hating and knew that it gave him an advantage. Authorities have gained a lot of insight into these personalities since their deaths because they not only left behind their websites and videos, but also journals chronicling their true feelings.