For any professional, they have the responsibility of acting like one. We know this is a requirement in any professional workplace, but professional athletes are also expected to uphold some type of standards. Even famous athletes require some type of sanctioning and business relationships, and they will not be able to compete without at least being sanctioned by the sporting body.
While athletes are famous for their athleticism instead of academics, it doesn’t give them a free pass to behave less than proper in society. In fact, they are often held responsible for despicable acts. Specifically for boxers and MMA practitioners, they should not be using their skills for any type of illegal act.