Sports are an organized place we have developed as an environment for us to express our most basic and stupid instincts rather than repress them.
As with many environments, opportunists try to find ways to exploit it for self serving interests. People enjoy gambling, for example, and that leads to exploiters trying to rig the odds.
Since there is a lot of money involved, it is unsurprising that the control and organization of sports would be sought after by powers but ultimately the audience puts much more faith in the players to have an honest desire to compete than they do the establishments organizing the games to be well intentioned. And gambling is the release valve, where if you believe it to be rigged a certain way then you can bet on it so it can never be too obvious if it's happening