>>149818892
Watchmen, like most of the standout superhero comics from the 80s and on, is a revisionist work, in that it takes an existing concept and reimagines it in a modern light with modern beliefs. Basically, it takes a non-traditional approach to the genre.
With Watchmen, Moore essentially turned the superhero genre on its head by merely adding a hint of realism here and there.
>>149818928
The concept exists, but it was originally a method of analysis, strictly non-fictional and non-narrative. Language has shifted to accommodate the marketing.