I don't buy it for a minute, but let's play that game. These boys were, I believe, Juniors in High School. I am more educated than they were and not nearly so violent. But, not so fast, what about the Unibomber. Also, many serial killers were very educated and have high I.Q.'s.
Education is just as likely to produce educated scoundrels as neglect does illiterate ones.
In four slim lines, Yeats proves that he is the best poet this century by diagnosing the human condition. You don't need to change, just learn to cope. The Christian view turns that on its head. Simple, it's because you are guilty. Guilty of sinning against God and your neighbor and yourself.