The aggression of a spectator in a sport is cause when the spectator thinks something unjust or unfair has happened. This normally happens when a game a spectator think that a game official has made a bad call. when they feel too emotionally attached to the game and it is not going as they hoped.
When there is a bad call by an umpire or ref or there was play against their child where they were hurt by unsportsmanlike like conduct the spectator will be easily upset their team is not having a good game
