The premise of your question is deeply flawed. It is radically different.
How many "young men" end up with broken bodies well before they make it to the big show? We just had a very young man at Univ. of Arizona (Kerr's alma mater) retire from basketball at 19 years old due to a 3rd tear of the ACL.
How many TBI's does it take before we end something that is clearly bad for society? You can't legally double leg tackle a guy standing on the corner, nor can one legally ingest many substances. Yet, society allows this "trade off" because it is sport. The logic falls flat on its face.