The hero, at first, is faced with the fact that he had to avenge someone's death. Since reasonable righteousness is not available, he must take the law into his own hands. His character displays an amount of independence where his actions are controlled by fate, and death couldn't have been avoided. We, the audience, believe that the sad thing is that it could have been: a tragic hero need not die, but if remaining alive he would suffer from ethical annihilation. It is always a delusion that nothing good comes from tragedies; but here, Hamlet's death was more or less for the best. If alive he wouldn't be able to have any contentment, as all the people he treasured were dead. In a tragedy the hero must have all good inidividualities, but one flaw that would lead to his demise. Hamlet has many good traits such as valor, fidelity and astuteness and one tragic flaw of hesitancy, which brought him his ruin.
There is the theme of appearance versus reality and this was the fact that leads to Hamlets tragic flaw, as he was the victim of the appearance of many people. Through the characters within the play, they all help to show the theme of appearance verses reality. Polomius, Rosencrantz, Guildenstem and the king all appear to be good and honest. As Hamlet finds out all contain lies and have hidden intentions within them. As each character is presented in the play all appear to be good and honest making it a difficult task for Hamlet to uncover the hidden truth about the nature of each character. As Hamlet best said it "something's is rotten in Denmark".
Polonious would always speak in a prescribed and preserved manner in order to capture the thoughts of Hamlet. This made it hard for Hamlet to respond to any of his questions, as he knew that any answer he gave, would be misinterpreted.
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Rosencrantz and Guildenstern were Hamlets childhood associates and so he knew them very well. He knew that they were sent by Claudius to spy on him.