Why do kids bully

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Last updated: April 8, 2026

Quick Answer: Kids bully for complex reasons including social dynamics, environmental influences, and individual factors. According to the National Center for Education Statistics, about 20% of students ages 12-18 reported being bullied in 2019. Research shows bullying often peaks in middle school years (ages 11-14) when social hierarchies become more pronounced. The American Psychological Association notes that children who bully are more likely to have experienced family conflict or witnessed aggression at home.

Key Facts

Approximately 20% of students ages 12-18 reported being bullied in 2019 according to NCES data
Bullying behaviors typically peak during middle school years (ages 11-14)
Children who bully are 2-3 times more likely to have witnessed domestic violence
Cyberbullying affects about 15% of high school students according to 2021 CDC data
The Olweus Bullying Prevention Program, developed in Norway in the 1980s, reduces bullying by 20-50% when implemented

Overview

Bullying among children has been documented throughout history, but systematic study began in the 1970s when Norwegian researcher Dan Olweus conducted the first scientific investigations. His 1978 book "Aggression in the Schools" established bullying as a serious social problem requiring intervention. The phenomenon gained increased attention in the 1990s with high-profile cases like the 1999 Columbine shooting, which was linked to bullying experiences. In 2011, the U.S. Department of Education issued guidance to schools about addressing bullying under civil rights laws. Today, all 50 states have anti-bullying laws, though they vary significantly in scope and enforcement. The definition has expanded from traditional physical bullying to include verbal, social, and cyber forms, with cyberbullying emerging as a major concern since the early 2000s with the rise of social media platforms.

How It Works

Bullying typically involves three components: repeated aggressive behavior, a power imbalance between perpetrator and victim, and intent to cause harm. The process often begins with social positioning, where children establish hierarchies through testing boundaries. Several mechanisms drive bullying behavior: social learning theory suggests children imitate aggressive behaviors they witness at home or in media; social dominance theory posits that bullying establishes social status within peer groups; and the frustration-aggression hypothesis links bullying to unmet needs or stressors. Common methods include physical aggression (hitting, pushing), verbal attacks (name-calling, threats), social exclusion (spreading rumors, isolation), and cyberbullying (online harassment). Bullies often target differences in appearance, ability, race, religion, or sexual orientation. The bystander effect frequently compounds the problem, as peers may witness but not intervene due to diffusion of responsibility.

Why It Matters

Bullying has significant real-world consequences for all involved. Victims experience increased risk of depression, anxiety, and suicidal ideation, with research showing bullied students are 2-3 times more likely to consider suicide. Academic performance suffers, with bullied students more likely to skip school and have lower grades. Bullies themselves face long-term consequences, including higher rates of criminal behavior and substance abuse in adulthood. Schools with prevalent bullying see decreased overall academic achievement and increased disciplinary problems. The economic impact is substantial, with bullying-related absenteeism and healthcare costs estimated at billions annually. Effective anti-bullying programs not only reduce immediate harm but also teach crucial social-emotional skills that benefit entire school communities and prepare children for healthier adult relationships.