What is most often the purpose of the genre of literature that Jackboots on Whitehall belongs in?
Jackboots on Whitehall: Jackboots on Whitehall is a 2010 British puppet adult animated satirical action comedy war adventure film set in an alternative history Second World War, in which Nazi Germany has seized London. Satire:  Although satire is usually meant to be humorous, its greater purpose is often constructive social criticism, using wit to draw attention to both particular and wider issues in society.
constructive social criticism