Reason number two is the fear of injury. I remember a conversation I had with Roy shortly after his 1996 bout against Eric Lucas. I asked him when the last time was that he'd cried. I was thinking about Gerald McClellan. McClellan, of course, is the former middleweight champion whose life has been turned into a living hell by extensive brain damage suffered in a 1995 bout against Nigel Benn.
All fighters are aware of the risks inherent in their trade.
Jones is particularly open about them. In recent years, this awareness of injury has been reflected in Jones's choice of opponents and, more significantly, in his fighting style. He no longer commits to his punches as frequently and forcefully as when he was young. He's a different kind of fighter now, even if the difference is only incremental. And that leads to point number three.