Answer:
1. people goofing around somewhat ruining the game for others.
2. boredom, need to look "cool", disagreement with the rules of the game, getting dared to do something, lack of participation, attempt to impress someone, lack of focus, hyper activeness, lack of activeness, or emotional/ physical pain related to the game.
3. It ruins the game for some people, can cause some people to get hurt, changes the way the game gets played, causes some to lose interest in the game, or destroys equipment and gear.
4. threaten to kick hooligans out of the game, ask them how the game can be changed to fit their needs, ask them if they need to take 5, or tell them they'll pay for whatever they destroy and it's not cheap.
Hope this helps :)
