I've broken my nose 4 or 5 times. My eyesight has deteriorated. I became very cowardly because I know the consequences of knockouts and knockdowns. I know what repulsed people look like. I avoid any confrontation.
And now about the pros. I have delivered a blow and have protection. I can act in spite of any dangerous factors. In short, I have become very careful, but at the same time I act, not numb.
Boxing (as well as other "percussion" martial arts) gives to any person: