through western society, too: think of how kids are banned from movies that depict nudity, but there are no age-limits on touring museums where the same nudity is on display
They’re not the same and if you can’t see the difference, that’s why you’ll never be a Supreme Court judge 
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Also, at least in the U.S., the guidelines for movie rating is not dictated by the government. And in European countries, my understanding is movie ratings don’t treat it so seriously.
