Well its not just losing but the way they lose. Two examples are Jermane Taylor and Cotto. I have seen both of them in two fights where they just pulverized. You don't want to these fighters permanently damaged. Some of you don't care, you are a bunch blood thirsty neanderthals acting as if boxing is like the arena of ancient Rome. When these fighters are battered and broken with slur speech or worst susceptible to Parkison disease from to many blows to head, they will be an afterthought in your mind, you won't even care about them anymore.
I think the real boxing fans are the best sports fans there is, because of the huge respect they have for the sport of boxing and everyone who steps in the ring. It's just annoying that other ppl who follow boxing reduce boxing and the boxers to a game of who beat who for whatever reason.