'See where they plan to ban holocaust ‘denial’ (revisionist in any way) videos and offer wikipedia instead.'

The general rule in the US is that no publisher has an obligation to print any particular view: that rule dates from when ‘publisher’ meant print and print was inexpensive. The founders intentionally strove to open a ‘marketplace of ideas,’ a ‘public square’ with pamphleteers and speeches. Published content was restricted only by the threat of litigation over libel or defamation which requires publishing material known (or should have known) to be false.