Violence in Sports

Violence in sports usually refers to violent and often unnecessarily harmful intentional physical acts committed during, or motivated by, a sports game, often in relation to contact sports such as American football, ice hockey, rugby football, lacrosse, association football, boxing, mixed martial arts, wrestling, and water polo and, when referring to the players themselves, often involving excessively violent or potentially illegal physical contact beyond the normal levels of contact expected while playing the sport. These acts of violence can include intentional attempts to injure a player or coach by another player or coach, but can also include threats of physical harm or actual physical harm sustained by players or coaches by fans or those engaging in the spectating of sports, or threats and acts of violence performed by fans or spectators upon opposing fans or other spectators.

Causes
There are two major theories on the cause of violence in sports. One theory holds that humans have an instinct for violence, developed during a time when early human ancestors had to resort to violence and aggressiveness to survive and reproduce. Another theory deals with the sociological aspects of violence in sports, stating that sports are "mock battles" which can become actual battles due to their competitive nature.
RITUAL VIOLENCE
High school, college, and even professional sports teams often include initiation ceremonies (known as hazing in the USA) as a rite of passage. A 1999 study by Alfred University and the NCAA found that approximately four out of five college US athletes (250,000 per year) experienced hazing.[2] Half were required to take part in alcohol-related initiations, while two-thirds were subjected to humiliation rituals.
Violence may also be related to nationalism or as an outlet for underlying social tensions. It is often alcohol-related.
FAN VIOLENCE
Violence by supporters of sports teams dates back to Roman times, when supporters of chariot racing teams were frequently involved in major riots.