If your starving in the wilderness, go ahead and shoot a bird on the ground. If not, be a good sport and wingshoot. If you like shooting things on the ground, come out to the prairies and shoot some gophers.
For those that have never wingshot, a 12G with 7.5 shot will not wreck a bird. Shoot, we lose more birds from the dog getting rough than we ever do from shot up meat.
If a guy in my hunting party shoots a bird on the ground, he'll get left at home in the future. Same thing goes for taking a low shot and not watching out for the dog.