What was the motive of the killers in the columbine high school massacre?

Answer 1

The motive for the murders at Columbine High School were hate and revenge. Not hate and revenge for bullying as originally thought, but for Harris' and Klebold's hatred of all mankind for being inferior to their superior intellect. Klebold was a typical underachieving, depressed teen who hated and blamed himself more than he hated or blamed others. 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.

Answer 2

2 students went in loaded with guns, pipebombs, gas bombs, the works. there plan was to blow up the school and kill any survoirs but the bombs didnt go off, so they just went around killing most people they saw, after an hour they commited suicide. they killed 12 students, 1 teacher and themsleves. R.I.P

Answer 3

Bullying

Edit: Some psychoanalysts suggest that Eric and Dylan may have had mental health issues, notably schizophrenia and bipolar disorder.