Well eagle to be sincere they are boxers and there profession is to fight.
So I mean if that was the case we might not have seen Erik vs. MAB III or Gatti vs. Ward III....

I see your concern but if that was the case why fight period?
One thing to make note of is that Vasquez fought the rematch so quickly after surgery. That's the reason why Freddie didn't want to take part in it. He said Vasquez was risking his life by going into the ring just months after surgery. Instead of the recommended 1 year.