Suppose that any of the people at the school that day, had been armed as is/was constitutionally intended? There would have been a far better chance that Harris and Klebold would have been stopped, and quickly.
I contend that it is, in fact, you that needs to learn the true ‘lesson’ of Columbine.
How many people have died, because of being illegally disarmed or prevented from arming themselves for defense?
I learned from jfpo http://www.jpfo.org/ the fact that governments kill their citizens. It's almost a fact of nature. Some regimes really do it "right" and wipe out whole segments, generations, ethnicities, or just lots of poor unfortunates. Many regimes at least try to pretend that they want to protect you. In actuality, government is merely a mask for the worst of human nature. It's almost, that by the process of collecting of all our permissions to do "stuff", all of our collective humanity is distilled out of the result. I would no more: torture an enemy combatants; impoverish future generations; or allow any infringement of any human right. So why when our collective will is assembled does it lose any vestige of our inhibitions?
It must be because the wielder of the collective power get intoxicated and forgets that they themselves are human. Power corrupts. Absolute power corrupts absolutely. It's like a brain disease.
The solution is to keep power in very small boxes. Tightly bound with our feedback. Delimited by "rights". Restricted to very limited situations. With horrendous retribution for transgressing.
The Intelligent Designer given right to life, recognized in the Constitution by the Second Amendment, says to me, that if I'm alive, I have "right", nay an affirmative duty, to stay alive. No person or group can deprive me of that right.
I can exercise that right to the extent that it does not interfere with the rights of others. For example, if I'm dying of organ failure, I can't kill you for your organ. My right to life ends where your right to life begins.
So, I have a right to defend myself. No law, person, or government can tell me I can't.
Seems so elementally simple.
Columbine would have been stopped by one armed teacher. There is at least one school shooting that was stopped when a teacher went to his car, returned with his weapon, and ended the rampage.
The value of concealed carry is that you don't have to carry to receive a benefit. If a criminal has 100 potential victims, then he has to pick one. If out of that hundred people ten are packing, then the criminal has a 10% chance of facing an armed victim. "God made men and women; Sam Colt made them equal." Hmmm says the criminal who should I pick? The gay guy. Ever hear of the pink pistols? The thin spindly blond woman. Agggg, that's Paxton Quigley and she's describing what a center of mass is to me. I know the squat little brownish guy with the big mustache, looks like an mexican arab. Ohhh, good day Mr. Massad Ayoob. Yes sir, I'd be happy to put my hands up. See the unarmed sheep are protected when we "salt" the flock with a few armed sheep. The criminal has to guess. Sometimes they will guess wrong … dead criminal! Don't have to worry about recidivism then.
Libertarians believe in Zero Aggression Principle; not the do what you want with me "I am a Victim" principle.
So politicians think that they can disarm us? I don't think so.