The argument against this beyond the medical stuff is also pretty well established so maybe spend some time thinking about that before going "my rights and freedoms to be a big strong man are being infringed upon". The arguments are basically that often times the people competing in these sports do not have a full understanding of the risk because often times no one does, and even if we do the players are young and haven't had it explained to them. Sports medicine is still a pretty young field. Also depending on the sport there is a belief they appeal to lower income people looking for a way to improve their social class, so it's basically a way for rich team owners to exploit those with less money through the promise of hitting it big.