The worst part of Animal Farm

Personally I think that the worst and most gruesome part of Animal Farm was when Boxer died. Boxer dies while trying to finish the windmill then without a second thought Napoleon sells him to the butcher. This shows that Napoleon dosn't appreciate the other animals and that he only cares about himself because he bought whiskey with the money they got from selling Boxer. The worst part of this I think though is the fact that Boxer was probably the only reason Animal Farm survived for so long in the first place. He was the most loyal and hardworking and all Napoleon was probably thinking was "Im glad it happened right before he was supposed to retire and not before."