If knocking brains around in football injures brains for life, then intentionally beating brains in boxing should result in some obviously impaired senior boxers.
Ali was a good boxer in his day. It made him rich and totally incapable of enjoying it
I don’t justify the things Muhammad Ali did outside of the ring by this post but you really don’t know what joy this man had in his life by doing the charity work and philanthropy that had little to do with boxing, Parkinson’s aside.
To disparage the man's gifts because of the times in which he lived and the choices he made in response, is shallow and ill-tempered. In an age when boxing was a heady and thriving sport, Ali was indeed "the Greatest."