You have no idea how many accidents there are involving deer. that's due to over-population.
Couldn't an argument be made to better educate and train drivers in areas where the deer live?
I doubt it would help. Unlike dogs and cats, deer have no defensive sense about cars. They'll run right in front of a car, or freeze in front of a car ("deer in the headlights look"). Plenty of accidents have been caused by deer actually running into the side of a car. And there have been reports of people who actually stopped--and the deer ran into their cars anyway.
I shoot, but hunting isn't for me. But I agree with Iceman: controlling the deer population is a worthwhile cause.