Kern's conclusion shares a resonance with Volokh's. They need a permit to climb a rock. Old-fashioned fisticuffs have been rightly banned, and fists are obsolete in an era of knives and guns and bombs. In the wake of Trickey's pathetic comment in Oklahoma about why he pulled the trigger of his father's legally acquired firearm, 'Because I'm crazy' makes a case for a sadly unfulfilled human being seeking validation. Our society doesn't allow access to lots of things that Tom could buy at the drugstore.
Most kids cope.
Some kids can't handle the isolation or depression, and hurt themselves. Others can't handle the internal rage, and become violent. Harris and Klebold, according to the tapes, had too much rage to settle for blacking someone's eye, and had no intention of living through their rampage. One should note that chemistry geniuses are revered in our school, not shunned. They were not all adults under the law, but they all understood exactly what they were planning, and what they did.