Columbine effect
The Columbine effect is the legacy and impact of the 1999 Columbine High School massacre and the shooters Eric Harris and Dylan Klebold.
The shooting has inspired several copycat crimes. Many killers took inspiration from Harris and Klebold. Some killers described them as heroes, martyrs or icons.
This short article about the United States can be made longer. You can help Wikipedia by adding to it.