20 years later and we still haven't learned a damn thing.
What? There were a lot of policy changes immediately in the aftermath of Columbine that have carried through to the current day. Zero-tolerance policies being chief among them.
I'd bet that zero tolerance policies have ruined more kids' lives than shootings have. In addition to the consequences of expulsion, if the response to bullying is to punish the victim, there's more of a motive to bully than there otherwise would be. Parents always believe the school over their kids and therefore punish their kids further for something their kids didn't do. We should talk about schools the way we talk about cops.