Earlier quoted context omitted.
But when you look at some sports, that's exactly what doing that sport on a professional level does.
Yea it's not good, we want to make sports as safe as we can.
Even just weightlifting on a professional level seems to harm a person's body, but it's only visible once they become older. You can't easily claim that "we ban drugs from sports because it damages people's health" when the sport itself also damages people's health.