I have no problem with the original poster's comments on hunting grouse with 22s or "head shots" on sitting ducks,,, but,,,
I do have some problems with "if it's legal, it's fine" attitude though... It is legal to have consensual sex with a 16 year old baby sitter,, but that may not go over well with the mother of your child,,,, or the babysitter's mother for that matter!!!
Extreme example perhaps, but fence lining someone's decoy spread from the roadside ditch is also legal, and I do think most hunters would agree it's not particularly ethical.
To me, it's a "no harm, no foul" as well as "within the law" issue.