Well, I think that paintball and other high level competition allows people to really show what jerks they can be at times, with the added element of the paintgun itself. Pro footballers (American football) can cheap shot someone, but not 15 times a second from the other side of the field. They can't get up after the play is over and keep tackling people and impact the game. Once a field goal is kicked or a pass thrown, it's either good or no good with less room for grey areas. There is instant replay.
Also, with pro players it isn't realized or stated enough that you can kick people out and they will be replaced. No one wants to do that, though, because there are connections. I won't name names here, but do you think someone gets hired by a major company that everyone knows and plays for their teams, acts up ridiculously, and their owners and captains will want to admit they hired a complete immature jerk, without hesitation fire them on the spot, hire someone else, and go through the whole process again of getting them into the team, replace all the ads picturing the previous guy with ones with the new guy, rename their products, and get the public to think that they are credible? Of course not. That's expensive, ego killing, time consuming, and can point fingers in directions they don't want pointed. We would be rid of some of the bad, but wipe out the infrastructure that puts forth the good games, products, and events that we see. Some moderation is definately needed, but it should be done with a surgical scalpel rather than a chainsaw or blowtorch.