Do sports encourage too much violance?

Hi guys, today I want to ask what kind of sport do you like and do Sport cause aggression? For example, boxing and wrestling are traditional sports which a lot of people enjoy. But in my opinion violence sports should be banned. They send a bad example, especially for children. I Think some of games make our kids more violent. There's many of evidence to suggest that violent crime increases immediately after a televised heavyweight boxing match. If we banned these kinds of sports, I'm sure there's be fewer wars, less violence crime and less school bullying. Do you think sport is often a modern substitute for war and violent sports must be banned? Why? I need to know your throughs on this meter. All the best