It's the flatness... a bullet can go further than you can see
I know this.
A muzzleloader can shoot far distances too, but they're not illegal even though you're shooting slugs through a rifled barrel. The woods in my area are extremely dense so a bullet isn't going as far as shooting in an empty field. My family owns over a hundred acres... if someone gets hit, they're trespassing.
Plus it's legal to shoot squirrels that are in trees during squirrel season with a .22. That is more dangerous than shooting a deer from an elevated position instead of the exact opposite.