When Hamlet attempts to direct the fate of his uncle and stepfather, King Claudius, he commits the mistake (hamartia) that results from his his overweening pride (hubris).
He is not an innocent; in fact, in some ways, he can be seen as contributing to the moral corruption that exists at the heart of the Danish court. He publicly humiliates Ophelia with his vulgar language, he murders Polonius as well as his once friends, Rosencrantz and Guildenstern, and despite his father's warning against it, he shames his mother. He installs himself as the moral police of the court, despite his own significant flaw(s).
This necessitates his own death, in addition to the deaths of his mother and stepfather, in order to cleanse Denmark and free the country from the family's corrupting influence. In order for Denmark to move forward, to make a fresh start, everyone who has contributed to the "rot" at the heart of the country must be cut out. Hamlet's hubris has made him a part of this rot.
Hamartia is a tragic...
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