This paper contends that violence in sports is increasing because athletes are given the opportunity to act violently on the sports field or in matches and are encouraged to act aggressively by fans and financial gain.
From the Paper:
"Sports is not just a past time any longer but a professional area in which the participants are no longer playing as a hobby but playing as professionals with a career, future and financial issues to think about and worry over. This has placed a great pressure on the athletes to win at any price because loosing has a harmful consequence upon their career, future and finances."