People buying books to burn them IS symbolism, nothing else.
This is not the real topic, but in these discussions at some point there is usually a false connection made between private actions and "censorship." The latter requires state action—it's not like some fundies can stop the sale or publication of the koran. In fact, as noted, they actually increase sales by the number bought to burn. Burn enough, and the next printing might be BIGGER

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Note of course that walking around with a Bible is likely a crime in most Muslim countries.