is it wrong that children wear open-crotch pans?

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a few days ago i saw a piece of news about teaching the nation's 1 billion people to be polite to welcome XXIX Olympics Games. spitting around the streetsis listed on the top of impolite etiquettes.i admit this is a definite coarse problem pervading some romote countryside. but what is wrong about children wearing open-crotch pans(kaidangku)? how can this be on list? did you ever wear kaidangku when you were a child? i confused. guy, say something.