"WHAT WE HAVE TO DO" VS. "WHAT WE WANT TO DO"

I've only made it halfway through Marina Warner's NO GO THE BOGEYMAN, whose first few chapters I talked about here.  The book's theme seems rather sprawling, and she's been accused of simply accreting loads and loads of data and dumping it into a thematically disorganized book.  I won't have an opinion on that until I've reached the end, but I'll say that even IF I find it true to some extent, I credit Warner with having gone the extra mile in her researches.  I'm particularly...