Columbine - Two children they convinced
Eric Harris and Dylan Klebold were two children that the atheistic media and culture convinced of their truths:
Once convinced of these truths, they were free to meditate on killing others until their fantasies became lethal reality; free to watch violent images until they weren't satisfied to experience the violence vicariously; free to listen to violent music until the message of death and suicide crowded out even the instinct to live; free to listen to words of hate that (after all) had no lasting, real effects on their philosophy or understanding of good or evil (concepts which aren't really definable, don't you see) until hate overcame love entirely - even the love of their own lives.
Once truly and thoroughly convinced that their lives, as the lives of others, held no value, they were free to kill and be killed, knowing that there was ultimately no true evil accomplished in the halls and rooms of Columbine High School - only acts that will fade away and be unremembered in the dim stretches of time. They were convinced (as should be anybody who believes these things) that their deaths, and the manner of them, were as meaningless as the universe which created them.
And our reaction to this as a nation serves to underline the lunacy of the culture which convinced them: It wasn't the kids who were evil, it was the people who made the guns they used. It wasn't the kids who were irresponsible, it was the politicians who failed to keep the guns from being manufactured. Are there too many guns? Possibly; we can discuss this. But to say that the people who made them are culpable, and not the people who saturate our society with images of gun wielding "heroes" cutting people down like wheat before the scythe, is to give up all claim to rationality.
To claim that these images which glorified exactly what these two young men did in their high school had no effect worth mitigating is to say that we have lost all capability for a commonsense assessment of cause and effect. God help us, this may be true in this stage of our cultural demise.
As we experienced in the days following the tragedy in Littleton, many others were not quite convinced, but close enough that a small push was all it took to send them over the edge and into the abyss of hopelessness. And they weren't satisfied to go alone; they all felt the necessity to take others with them. This is the ultimate act of selfishness in a selfish society.
Be prepared for far worse. When the kids see that the adults cannot agree to constrain their own lusts and desires in order to protect them, they will become even more convinced that the pursuit of morality is a non sequitur; more meaningless words in a meaningless world. And they will act on that in ways that Eric and Dylan would applaud if they were still with us.