They are over thinking it.
Shorter season equals less deer killed to hunters more deer killed to automobiles.
Longer deer season (or higher bag limits) equals more deer harvested to hunters to use them and less to autos to rot on the side of the road.
The mentality that shoot less will mean more deer is akin to not keeping fish out of a lake so there will be more fish.... That's BS too, you can't hurt a lake (fish population) with a hook. Carrying capacity determines how many fish are in a lake and how many deer are in the woods.