A fist fight can be a good thing, a growing experience. It can be empowering, a glorious raw victory which satisfies the primal self. Or a shocking blow to the ego, sometimes a person needs it. The purpose of the ring, gloves, ref, etc. is to control the environment for safety sake. There are things that are exposed in people during a real fight which can't be extracted in semi-controlled, fabricated ring fights.
I agree it's sad to think people become crippled or die sometimes, but if it wasn't dangerous then it wouldn't affect people the way it does naturally. I just happen to think that it's more important to preserve our nature by not censoring or padding life.