Many might say that the cost of Hamlet's revenge is death. True that is one outcome of his revenge, but that is not all. In William Shakespeare's Hamlet, we find out about the other consequences of revenge. This is a story of murder and that is indeed what Hamlets revenge is. As Lord Hamlet's ghost says, "Murder most foul, as in the best it is" (1.5.33).
While Hamlets actions affected many things, perhaps the most significant action was that which took place near the end of the play. Everyone who is supposedly guarding the castle is so wrapped up in the drama of Hamlets revenge that they forget about doing their job of keeping watch. While watching the ominous fencing match between Hamlet and Laertes, Norway's army surrounded and invaded the castle. Because of the lack of guards, the army easily overpowers the few men keeping watch. Seizing control of the castle, Norway now ruled Denmark. The Norwegians, expecting more resistance were surprised by the number of people dead "This quarry cries on havoc" (5.2.403). This was clearly the most significant consequence of Hamlets revenge.
The entire royal family was also greatly affected by Hamlet's revenge. Once the King, Queen, and prince were dead, no one else was left to take over the crown. Perhaps the murders were a selfish thing for Hamlet to have done. He did not consider the long-term affects his actions would cause. When he committed his first murder and subsequently his first act of revenge he certainly did not realize what events would follow and eventually lead to the demise of Denmark. Surely he did not anticipate Ophelia's death nor his mothers and certainly not his own. Hamlet most likely was not expecting the dozen or so deaths that came out of his revenge.
Possibly he did not know of any other alternative to killing the King. Maybe he was too mad to clear his head and think of other alternatives. Hamlet was certainl...