The problem with the Columbine, and other school shootings...done by victims of bullying, is that they just opened fired, firing randomly. I, honestly, would have no problem if the only people killed in those shooting were the bullies. Actually, the ONE drawback is that the victim who couldn't take it anymore, and killed the bullies, would be portrayed as the villian...and probably charged with murder. Unfortunately.
As you can tell, I have ZERO sympathy for bullies.
As for stooping to the bullies level...Unfortunately, that is the only way. Bullies understand one thing, and one thing only...FEAR. You have to make the bullies afraid. Afraid for their very lives. Make them realize that if they try to bully you, you WILL take EVERYTHING from them. That GOD himself won't be able to save them. Do that, and will have no more problems from bullies.
i am not sure about other school shootings but in the case of Columbine, from what i recall of the true facts (NOT that BS published by the conspiracy theorist who's made money off the 10th anniversary with his crappy book), the MAIN bullies of Harris and Klebold were the jocks and the popular bitches. but the rest of the student body joined in by helping to laugh at them. so in cases like that, it's likely they'll shoot at everybody because everybody is the bully in their mind.
and most bullies don't get fear. at least not that i've encountered or that i've seen portrayed in the news. at least not immediate fear of being attacked. some of them DO get the fear of the rest of their lives being ruined...hence why i believe in prosecuting their asses to the fullest extent. plus the bonus is even if they get a stupid judge/jury who lets them off and doesn't see their criminal behavior for what it is, they have still ruined their lives because the Internet never forgets. every employer, every college, every paranoid wannabe boy/girlfriend will find evidence of their crimes online, so at least there's some damage done to them even if they don't all get the jail time they deserve.