All of these reduce the chances of hooliganism, eliminate the need to segregate fans from opposing teams, and ultimately negate the threat of a closed door game due as a consequence of fan violence. In rare circumstances where a serious incident has occurred (such the 2004 Pacers–Pistons brawl in the NBA), sports authorities have leaned toward identifying and excluding the specific people involved as opposed to indiscriminately punishing the wider, law-abiding fan base. In contrast to the rest of the world where "behind closed doors" games are given out as penalties for previous violations or to prevent potential violence (stadium safety issues, checkered history of rival supporters), such occurrences in North America have happened for entirely different reasons.