Understanding Violent Behavior In Children and Adolescents

“The term school shooting most commonly describes acts committed by either a student or intruders from outside the school campus. They are to be distinguished from crowd-containment shootings by law-enforcement personnel”
“In the United States, one-on-one public-school violence, such as beatings and stabbings or gang related violence”
“The National Rifle Association is opposed to such laws, and some groups have called for fewer gun control laws”
“Some areas in the US are experimenting with the idea of armed classrooms to deter (or truncate) future attacks, presumably by changing helpless victims into armed defenders.”
“the armed school approach for preventing school attacks, while new in the US, has been used successfully for many years in Israel and Thailand. Teachers and school officials in Israel are allowed and encouraged to carry firearms if they have former military experience in the IDF, which almost all do.”

http://en.wikipedia.org/wiki/School_shooting

§ reach their peers with violence prevention education
§ recognize warning signs of potential youth violence
§ encourage young people to report troubling behavior
§ collaborate with school and community resources to address youth violence
§ develop and implement local action projects to reduce the potential for violence in their school.

http://www.fcclainc.org/content/stop-the-violencestudents-taking-on-prevention/

Previous aggressive or violent behavior
Being the victim of physical abuse and/or sexual abuse
Exposure to violence in the home and/or community
Genetic (family heredity) factors
Exposure to violence in media (TV, movies, etc.)
Use of drugs and/or alcohol
Presence of firearms in home
Combination of stressful family socioeconomic factors (poverty, severe deprivation, marital breakup, single parenting, unemployment, loss of support from extended family)
Brain damage from head injury

http://aacap.org/page.ww?name=Understanding+Violent+Behavior+in+Children+and+Adolescents&section=Facts+for+Families