There is a frequent use of villainy in the United States. They could be bombings, massacres, and betrayal in the country.
The Columbine massacre took place in April 20, 1999 in Columbine High School.
San Ysidro McDonalds massacre
On July 18, 1984, James Huberty, shot and killed 22 (including himself), injuring 19 in a San Ysidro, California McDonalds.
A misogynist and white supremacist, George Hennard, shot and killed 24 people, including himself on October 16, 1991. 22 people were injured in the shootout.
Pulse Nightclub shooting
Omar Mateen an islamic terrorist shot and killed 49 people, including himself in an Orlando, Florida nightclub, on June 12, 2016.
See article: 9/11