Explain in a short paragraph what can trigger spectator aggression in sport

You'll find some material to explain this problem here:

http://www.bing.com/search?q=sports+spectator+aggression&go=Submit+Query&qs=n&form=QBRE&pq=sports+spectator+aggression&sc=0-0&sp=-1&sk=&cvid=BED0C0185ADF4D7E86F3DA906500C2FC

More here:

http://www.google.com/?gws_rd=ssl#q=sports+spectator+violence

Spectator aggression in sport can be triggered by a variety of factors. Firstly, intense rivalries between teams or individuals can inflame emotions and lead to aggressive behavior among spectators. This can be exacerbated by factors such as historical animosity or excessive passion for a particular team. Additionally, controversial decisions or referee calls can incite anger and frustration among spectators, resulting in aggressive responses. Moreover, alcohol consumption can play a significant role in lowering inhibitions and fueling aggressive behavior. The combination of these factors can create a volatile atmosphere that triggers spectator aggression in sports.