If you see something come and go the way they should, then it wouldn't seem so sad. Like, its a commonly and socially accepted that chickens exists as food to many other creatures. Like horses exist with the purpose of becoming modes of transportation to human. Or the Lions limited existence to ensure there will not be too much herbivores around or the greens will be gone. Things are the way things are and that should remain.
So, seeing a bird die in a way it shouldn't in a way felt really sad, cos that's just not how it was supposed to be. It was crippled and ran over by a car. Its not meant to be.
Like eating shark's fin and killing an elephant for it's tusks. There are animals that are created to be food to others and some are not. And that should remain.