Aggression in a sporting environment falls within the area of social psychology. Whether it's seen on the field as a defensive tackle lines up to protect his quarterback in American football, or when fans clash off the field such as the Black Wednesday clash between Liverpool supporters and those of Juventus at the Heysel Stadium, Brussels in 1985, the field is a great place to look for examples of the theories of social psychology.
An essential element of sport psychology is dealing with the emotions that come with competitive athletics. Whether you are an athlete, a coach, a referee, a parent, or a fan, the higher the level of competition, the higher the emotional level can become.
Research shows that people tend to default to trusting others over distrusting them, believing them over doubting them and going along with someone’s self-presentation rather than embarrassing them by calling them out.