I'm sorry you feel that way, we have had to become hardened to it, living on the edge of forests as we do. I do remember being quite upset the first time, about 8 years ago. And a few times after that. You can try phoning your highways department, ask them to move it, it might at least make you feel as if you are doing something positive. My rather religious sister said a prayer every time she passed a dead animal around here, in the end she couldn't keep up, she said, in the Spring. So many young and inexperienced little animals.
I try to see it as, the survival of the fittest.
Now I am more likely to worry about the drivers - DBH had the front taken off my car a few weeks ago when he had to borrow mine. A muntjac ran underneath it. not a big one, thank heavens. Although we have had one leap over a hedge and land on the bonnet. Around a dozen deaths are caused ever year, but the number of deer killed is far higher. We have all sorts of experimental buzzers and lasers and road-calming experimental areas and things going on through the forests, and people say it has got better, but it still happens.