Explain why Napoleon violates resolutions that have been established once he assumes power in "Animal Farm."

I think that this is one of the most fundamental questions
that surrounds Napoleon.  It shows how "power corrupts" and that "absolute power
corrupts absolutely."  Additionally, Napoleon's violation of resolutions reflect how
there is a fundamental difference in trying to obtain power and then securing it for
one's own benefit.  Napoleon violates many of the tenets of Animalism, and does so in
order to consolidate his own power and sense of control over the animals.  Negotiating
and trading with humans, consuming alcohol, and ensuring that the voice of the pigs is
the only one heard on the farm are all examples of how Napoleon has violated the
commandments to which Animalism is supposed to uphold.  In doing so, Napoleon recognizes
the need to ensure that his political power and his sense of control cannot be risked. 
Similar to Squealer's ability to twist the truth and facts in order to demonstrate
Napoleon's superiority to the other animals, Napoleon feels that compromising and
violation of the tenets of Animalism will be able to continue his rule without
impediment or obstacle.