Why must Hamlet die?

The literary scholar that I most agree with is G. Wilson Knight. I agree very strongly that death is the theme of the play and that everything happens because of it. There is a remarkably large number of people killed in the play, and it is all because of the death of King Hamlet at the start. I also agree that the ghost is simply a catalyst for the play, and that it is not meant to be good or evil, although Hamlet must decide if it is. G. Wilson Knight believes that Hamlet's soul becomes dead when his father dies and mother remarries. It is his view and mine that the depressed and death obsessed Hamlet infects the whole play and can not be stopped by anything but with his own death. I feel that part of Hamlet has died with the death of his father, and the remarriage of his mother and the visit from the ghost blaming his uncle drive him even further away from the man he once was. I don't think the damage done to Hamlet can be undone, and I don't think that anyone would stay safe with Hamlet around. For this reason, I think Hamlet must die. I think everything in his life he once lived for is gone, and he is filled with meaninglessness. Hamlet becomes so immersed and confused about death, that he becomes obsessed with the idea of it. Hamlet admits that he would kill him self, were it not a sin. In conclusion I feel that Hamlet is no longer the person he once was, and has given up on happiness because of it. All the death around Hamlet affects him too strongly to continue living his life like before and to find it in himself to forgive his uncle and go on with his life. Hamlet can not live with himself if he avenges his fathers murderer, but he also can't live with the idea of committing such a crime. I feel that Hamlet must die because his soul has already died with his father, and the man that he has become is too far from the man he once was.