In William Shakespeare's Hamlet, Prince Hamlet replaces the letter that Rosencrantz and Guildenstern are carrying to England with a forgery of his own making, thus sending these two men to their deaths. He does this without giving it a second thought and never suffers from any guilt or remorse for his actions. Considering that these two men were friends from his youth, this would at first glance seem to reflect poorly on his character. However, one must consider carefully the characters of Rosencrantz and Guildenstern before passing judgment on Hamlet.
             Rosencrantz and Guildenstern are sent for by the King and Queen to spy on Hamlet and learn why he "puts on this confusion" (III, i.2). While some are fooled by Hamlet's act of insanity, the king is not. He is convinced that it is an act and, being a sly man himself, he suspects that Hamlet is up to something. Having obtained the throne through deceit and murder, he believes Hamlet capable of the same. While King Claudius is evil, he is not a fool and he would never have sent for Rosencrantz and Guildenstern if they were such close friends of Hamlet. They are even told outright that they will be rewarded for their efforts (II, ii. 21-6).
             The very fact that they undertake this task for the king is proof enough of their lack of love and loyalty toward Hamlet. Despite their actions, Prince Hamlet gives them ample opportunity to show their loyalty by admitting that they were sent for and why. By showing so much reluctance, they show themselves to be allied with the king. Hamlet asks them to "be even and direct with me, whether you were sent for or no." But after this direct question, Rosencrantz still looks at Guildenstern and asks if they should tell the truth (II, ii. 303-5).
             There is no reason to believe that Rosencrantz and Guildenstern have the conviction that Prince Hamlet is indeed insane. When they report back to the king, they refer to Hamlet's actions as a "crafty madness"...