I don't see any problem with people holding other fisherman accoutable for good C&R practices. Should actually help the sport I think...

Think about gun control. Rebember the video of the 3yr old who grabbed his dads gun from the trunk of the car and played with it for a while with no supervision? Should sportsman just look away when they see obvious bad judgement by another sportsman? I think that attitude would leave a bigger black eye for the sport than standing up for good sportsman like practices.