If they carried a surgery manual that told its readers that the proper procedure for a tonsillectomy involved removing the spleen, it would be wrong to sell it.
Refusing to sell a book that tells its readers that autism can be cured by drinking camel milk or bathing in chlorine dioxide is not wrong, it is the correct and moral stance.
If they sold a car repair manual that told its readers the proper way to fix a clogged fuel injector was to stuff bananas into the throttle body, I would expect that Amazon would refuse to sell it once it was brought to their attention.
I don't understand the cries of "censorship!"
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