Crocker’s Rules were a reaction to the avoidance of direct discussion of topics where some people treat the mere act of discussion in any capacity as offensive. Sacred cows and taboos for which there are social consequences even when asking honest questions. Crocker’s Rules, practically speaking, were a declaration that no good faith discussion was intrinsically offensive ipso facto for the person making the declaration. All taboos were open to good faith arguments and attempts at rigorous intellectual inquiry.
This article is focused too much on communication style and not enough on the subject of communication. The latter was the crux of it. Crocker’s Rules were about being able to rigorously discuss topics that society has deemed to be beyond discussion without taking offense at the fact it is being discussed.
I was present when Crocker’s Rules were “invented”. I see a couple other handles here that may have been as well.