Yes, as already mentioned the deer population can be out of control. I have to say on behalf of those who love to hunt and for those who don't understand it, hunting may seem to sound cruel, however having lived in northern Wisconsin and Minnesota where there are so many deer that if the population was not kept down by hunters, many of them would die of starvation if the winter was long and cold. Starvation would not be my pick of a way to go. Come spring when the snow melted in the fields first, the deer would come out of the forests to eat and we would see as many as a hundred deer grazing in the fields on the side of the rural roads. And that is after hunting season which is in the fall. Imagine if no one hunted. You had to be ever on alert, because you never know when a deer was going to jump out in front of your car. We had a near miss once where we hit a deer (my ex did) and it managed after hitting the front side of the car to be thrown in the air over our car. Had my ex been going slower, it would have come right through our windshield and I can only imagine how bad the accident might have been. (of course I wouldn't have been driving like a bat out of hell like he always did either so the need to 'fly' for the deer at all might have been avoided.. )
Any way, a lot of people enjoy eating venison (sp?) as well, so it can put food on the table. It doesn't happen to be my favorite however venison made into salame is delicious.