There is no excuse for not clearly seeing your target and what's behind it before releasing the arrow. If that means you miss out on the big buck or tom because you can barely see it, so be it. At least you're not taking the chance you're going kill the neighbor dog or kid. Nothing is worth that. And isn't ethical bowhunting about great shot placement that is going to down the animal quickly? How do you achieve that by shooting willy nilly at movement?
Unfortunately, a father killed his 9 year old son in Minnesota last year (hunting with no license and under the influence of drugs and alcohol), shooting again, at movement. It's just so sad. That's why during the 9 day gun season here, the kids and the dogs stay inside, not because of me, but because I'm not willing to take the chance someone out there is going to mistake them for a big buck, which is ridiculous, but necessary to do so I can still tuck them in at night.
One more example, seven years ago in Minnesota, an old-timer decided to shoot the deer he saw 200 yards away from his front porch. After he fired the shotgun slug perfectly into his target, he saw the horse with the 12 year old girl on it crumple to the ground. The slug had just barely missed one of her legs.
Know your target. Maybe that person or animal shouldn't be there for whatever reason, but I'd rather not be responsible for taking their life.