<p>I am writing about how Hamlet was responsible for his own downfall and I need to flesh out my essay.</p>
It is easy to understand why Hamlet can be accused of being his own worst enemy. Hamlet gets stuck in his own thoughts, which prevent him from acting on a decision. He is depressed and obsessive. He teeters between suicide and taking revenge for his father's murder. Hamlet wants things to be different, he is unhappy with Denmark, unhappy with his family.
Hamlet knows that his uncle has killed his father, yet he does not act on this terrible wrong until he has proven to himself that his uncle is guilty.
When Hamlet's mother marries his uncle, Hamlet is unhappy that she has acted so quickly. He can't accept it so it eats him up inside. Ideally, Hamlet wants to makes things right, he wants his mother to give up her relationship with his uncle. He does not want to be a murderer, even if it is to avenge his father's murder.
He does not want to commit just another revenge murder. For Hamlet it is more of the same, he would be acting like his uncle. He wants the reality before him to be different so in that sense, he is a bit of an idealist, or someone who has a vision of how the world should be and rejects reality because it does not meet the standard of his view of how things should be.