Although Hamlet bitterly denounces himself as "a rogue and peasant slave" and takes himself harshly to task for apathy and inaction, how does he nevertheless demonstrate intellect and moral superiority?

Although Hamlet bitterly denounces himself as "a rogue and peasant slave" and takes himself harshly to task for apathy and inaction, how does he nevertheless demonstrate intellect and moral superiority?

Even though he is extremely mad in this scene, he is still able to clear his mind and make a good decision on how to kill Claudius.