Moore's reasoning processes are controlled by his Leftwing compulsions. There is absolutely no reason to attribute any evil act to the tools, that the evil doer uses. Anyone with a modicum of ordinary intelligence understands that. Do you blame the invention of the automobile, if some psychotic deliberately drives a car into a crowd, at high speed? Do you blame the airplane or the Wright Brothers for what happened on September 11, 2001, in New York City or at the Pentagon?
The Columbine incident was but one of a string of like incidents during the latter years of the Clinton Administration. On the subject, at the time, we offered a more rational suggestion than Mr. Moore's, as to causation:
Suicidal Rage vs. "Something Of Value"
William Flax