Although this mini-series of WP:60 installments is all about "what Wikipedia is not", none of these self-imposed limitations are intended to abet censorship. The guideline is clear: "Wikipedia is not censored".
Encyclopedias must necessarily cover some topics readers may find offensive, and Wikipedia will do so notwithstanding inevitable complaints. And the complainants have included none other than estranged Wikipedia co-founder Larry Sanger.
When objections arise—and they certainly have!—the primary test is whether the content is appropriate and informative given the subject at hand. The debate has been particularly heated at times, considering that children often use Wikipedia for schoolwork and yet some categories are entirely NSFW.
In the final accounting, here is why it's a very good thing the Wikimedia Foundation (WMF) is based in the United States: the First Amendment.