Gladiators of stadium

I don’t believe when the TV shows the violence practiced for several people when they meet to see a game of soccer played in the stadium.
This problem it’s not exclusive of Brazi.l We have been seeing this problem all over the world.
I don’t understand why one person has a violent behavior when he/she meets with other people. We have seen fights with fans of other teams. They fight with fans of the same team.
It is only a soccer game. We don’t win some thing . Who wins some thing are the players that work for the club, and have an obligation to defend the team. Furthermore they win very well to execute their work.
Some countries like England the problem is less with hard action that controls fans that involve in conflicts while the games happen.
Here the problem is old but we don’t haven´t seen a solution. They fight and break a lot of things and who pays for the damage.
The police combat this with correct action and the government doesn’t develop preventive action that diminishes the violence in the stadium.