I guess a non-confrontational approach would be the best. Point out the deficiancy to the scoutmaster/ committee chairman, or perhaps the troop advancement chair, whoever I felt I had the most raport with. Give the advice in an educational tone, maybe they aren't aware of the deficiency. Once they have been informed, if they choose to continue it, I guess I would let it pass, since like you said, I don't want to antagonize the unit and have them throw me out on my ear.