Chapter 6 in Animal Farm. How does Napoleon react to the destruction of the windmill? Whom does he blame and why?

When the windmill falls apart in this chapter, Napoleon
blames Snowball.  Napoleon blames him because Snowball has been designated as the enemy
who is the cause of all the bad stuff.  Napoleon needs a scapegoat like that because he
cannot admit anything is his fault.

In this story, Napoleon
has set up a system where he is like a god of sorts -- it's called a cult of
personality.  If he ever admits he's done something wrong, it will ruin his image and
reduce his power.  So when something bad happens, he blames it on Snowball and portrays
himself as defending Animal Farm against Snowball and all the other
enemies.