Hi!the main theme of the poem All the world is as a stage is that man is the ultimate loser in the game of life.
I believe the Queen thinks that A. the death of his father caused Hamlet to go insane.
This is what she says in Act II:<em>"I doubt it is no other but the main: His father’s death and our o'erhasty marriage"
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This is what she says to Claudius, her ex husband's brother whom she married after king Hamlet's death. She clearly states that it is the king's death which drove Hamlet to madness, as well as the fact that she remarried only a couple of days after that happened. Polonius thinks Hamlet is mad because of Ophelia and the fact that she killed herself, but Hamlet never really cared much about Ophelia (especially after his father's death), whereas Gertrude thinks it is because of his father.
I believe the answer to this is "true." Really, all conclusions on all events are subjective. But considering history, conclusions on events are especially prone to subjectivity. Consider who writes the history books. If one country wins a war against another country, they will write about themselves as the noble party and portray the enemy as villainous. However, this may not be the real case. This occurs much more than we think, and we must research different events to make sure we are not blindly buying into what people say. Hope this helps.
I'm pretty sure it is Theme.
Theme is the central topic of the text. passage, story, or anything else. So it may possibly also be the same for the underlying meaning and universal truth...but again, I am not sure.