i don't think Hamlet wasn't insane at all. He just had some family problems, he just dealt with them in different ways. A lot of people thought Hamlet was crazy because he was pretty much killing every one that had been forced on him by the new king. Hamlet really only wanted to kill the king to get revenge for his father. Insane can mean a lot of things in so many ways, it can mean being mentally ill or can mean strong and powerful. "Your grace has laid the odds thy weaker side" (sir Hamelt)
