It’s twenty years since the massacre at Columbine. Have we learned anything since then or will it happen again and again?

NicolaD
Survivors of the Columbine High School shooting have been speaking at a remembrance ceremony in Denver to mark the twentieth anniversary of the massacre.

Twelve students and a teacher were murdered by two teenagers.

Has America (or indeed the world) learned anything since then or do we just brace ourselves for school shootings to happen again and again.
It’s twenty years since the massacre at Columbine. Have we learned anything since then or will it happen again and again?
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