The British do have a difficult or perhaps just different relationship with heroes vs the US IMO. Some study has been made of this in the past. Even in comic books, where writers have traditionally been afforded more freedom (morally, philosophically, martially/violence, sexually even). Even in pure fantasy/sci-fi (take WH40K as an example). There are many fine US creators/studios, and excellent output, but I don't think the satirical and political elements could have come from there.