This subject can be debated back and forth as far as ethics. I personally do not shoot turkeys off the roost, but I work with a couple of guys that do. They grew up stalking turkeys, not calling turkeys. It's natural for them to stalk and shoot if the bird is in the tree or on the ground. I would have a hard time telling them it was unethical. Their stories are often a blast to listen to. They say it's a challenge to tip-toe in under a gobbler at daylight, and many times are detected and come home with nothing. It's not like they walk in pitch black dark and shoot him while he's sleeping. They get up just like we do and wait for one to gobble, then stalk him. If they can tip-toe under him, good for them.
WM