The term allusion should be changed to the term irony.
His father dies, and his mother marries his uncle. This stress put on him is what essentially created his tragic flaw. Hamlet's tragic flaw is his indecisiveness to make selections. This trait is established at some point in the entire play and causes Hamlet to his personal demise.
His indecisiveness comes from the way he reacts to the conditions he's installed and the manner his mind affords these situations to him. The most important indecisive moments are Hamlet's mind, his father's ghost, and his vengeance on Claudius.
One of most Hamlet's interesting functions is that he's in reality aware that he's failing to act. We're frustrated. He's frustrated too. He knows, all too nicely, that he's indecisive and dedicated to the importance of ethical ideas.
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