Perhaps Sherlock and Moriarty both have the same basic character structure and drives, but circumstances have led one to serve order and the other disorder.
The primary message seems to be this: a literal lie, told solely for the joy of telling it and hearing it, can be a beautiful thing.
While watching Sarah slaughter a whole family of cave dwellers, after losing her own child earlier in the film, I had to wonder: is having kids a really bad idea?
The word 'horse' and the word 'unicorn' have the same status - they are both simplified abstractions of commonly held, fairly complex ideas.
Pascal's wager only makes sense in a world where there are two religious options - atheism or Christianity. If the only god humanity had ever dreamt up was the trinitarian deity of the New Testament, then Pascal would be correct. But as it is, there are an inconceivable number of gods past and present floating around in the heads of us weirdos.