Roadkill is practically vegan from an ethics point of view. Veganism is all about the most reasonable reduction of animal harm possible. Eating an animal that’s already been killed does not cause further suffering to animals, and since roadkill draws scavengers to the roadside, the presence of roadkill can lead to further animal death. Removing roadkill from the roadside is a net positive for animals. It’s also more eco-friendly than the usual alternative which is to ship the carcass to a landfill and undergo anaerobic breakdown.