There is a frequent use of villainy in the United States. They could be bombings, massacres, betrayal, assassinations and political in the country. This list is only for the most extremely serious crimes such as terrorism and mass murder.
Assassination of Abraham Lincoln
See article: John Wilkes Booth
Assassination of John F Kennedy
See article: Lee Harvey Oswald
Helter Skelter (Manson family scenario)
See article: Charles Manson
San Ysidro McDonalds massacre
On July 18, 1984, James Oliver Huberty, shot and killed 22 (including himself), injuring 19 in a San Ysidro, California McDonalds.
The Last Christmas
See article: Ronald Gene Simmons Sr.
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.
1993 Waco siege
See David Koresh
Oklahoma City bombing
See article: Timothy McVeigh
Heaven's Gate mass suicide
See article: Marshall Applewhite
The Columbine massacre took place in April 20, 1999 in Columbine High School.
See article: 9/11
D.C. sniper attacks
Virginia Tech shooting
See article: Seung-Hui Cho
Fort Hood shooting
See article: Nidal Malik Hassan
2012 Aurora shooting
See article: James Holmes
Sandy Hook Elementary School shooting
See article: Adam Lanza
Boston Marathon bombing
2014 Isla Vista killings
See article: Elliot Rodger
Charleston church shooting
See article: Dylann Roof
2015 San Bernardino attacks
See article: Rizwan Farook and Tashfeen Malik
Pulse Nightclub shooting
Omar Mateen, an Islamic terrorist, shot and killed 49 people in an Orlando, Florida nightclub, on June 12, 2016. Later, he was shot and killed by the police.
2016 shooting of Dallas Police Officers
See article: Micah Xavier Johnson
2016 New York and New Jersey bombings
See article: Ahmed Khan Rahimi
2017 Las Vegas shootings
See article: Stephen Paddock
2017 Sutherland Springs church shooting
See article: Devin Patrick Kelley
2018 Douglas High School shooting
See article: Nicholas Cruz