I hate seeing my car damaged too. It's discouraging for me to finish the race in that state, but at the same time it adds to the experience and it makes for a good challenge not to rough up the car too much so I'm okay with it.
I always hate to see my car damaged, but if you could take that off the game, it wouldn't be the same thing. It's necessary, and it's a motive to drive well, so you don't screw your car.