Deer are a nuisance and a hazard in many areas due to overpopulation, because there aren't enough predators to be relevant (humans included). There are frequent collisions with deer on the highways, leading to people dying. Deer overpopulation can cause starvation and disease both for deer and other animals. Not sure if there's "too many" deer where you are too, but I would guess so. They tend to become overpopulated wherever they are.
I do think it's best to use the meat, but deer are a case where there's an additional reason to cull the population. I don't really have a desire to hunt, myself (let alone the ability) but venison is delicious.
Anyway, cool critters.