Why is Hamlet a tragedy?

Hamlet is a tragedy because the story leads to the death of the hero and everyone he cares for. Although the Hero Hamlet does exact some revenge. He catches the King in his own treachery. He than makes the King drink from his own cup of death. Even though they all die tragically Hamlet does have the opportunity before his death to see his enemies lies revealed. This event made the story a little less dark. Had it ended with the King living and getting a way with everything than that would have really been twisted. Fortunately it didn't end that way. I think we all like to take hope in the fact that the King didn't get away with everything. That little fact puts some moral to the story and lets us feel that evil won't conquer good.