"If" in Hamlet

I understand that in literature, speaking in terms of “if” is, for the most part, forbidden.  By “if” I mean that writing if something had happened, then something else would have happened is not taken too fondly in literature.  However, I feel as if I need to address the “if” factor in Hamlet because I feel as if the play can change with whatever interpretation it has.  First off, when Gertrude, Polonius and Claudius are discussing Hamlet’s mental state, Hamlet walks in reading a book.  If he had overheard the three of them talking about him, this could give him a moral boost since he would understand that they are all buying into his facade of a crazy man.  This leads to the next “if” in the play.  If Hamlet is truly acting crazy, then what is the reason for this madness?  He could be going insane over the fact that he just spoke to his father’s ghost or the realization that his father was murdered by the man who is now his mother’s wife.  Yes, this could lead a man to go insane, but he still comes out with smart and witty retorts when speaking to Polonius, thus making him look smarter than Polonius.  If a man was going insane, I doubt he would have the time, or mental ability for that matter, to come up with such smart responses; this leads into the next “if.”  If Hamlet is actually acting rather than being crazy (or “seeming” rather than “ising”), then why is he doing this?  What is the purpose of his facade?  His smart, witty comments could now be seem as him trying to confuse Polonius rather than simply trying to outsmart him.  Another “if” that has been playing on my mind is the case of Ophelia and her possible pregnancy.  If Ophelia is portrayed as a less-than-innocent character, she could possibly be pregnant with Hamlet’s child since her father has ow banned her from seeing Hamlet.  This could be due to the fact that the father knows about the pregnancy, yet Hamlet seems to know absolutely nothing about any of this, so this could be a possible reason as to why Ophelia can no longer see Hamlet in fear that he would not have a kind reaction to Hamlet.  However, if Ophelia is an innocent girl after all, she could be as utterly confused as she seems in the play.  If Ophelia has not been having relations with Hamlet, then her father could be pulling her away from him for fear that she would look bad in the public eye since he is rapidly going insane, which could tarnish her reputation.  However, Ophelia has not seen Hamlet between the time that he begins to go insane and the time that her father has banned her from Hamlet, so she could not know what is happening with Hamlet and why she is now banned from seeing him.  She could either be a naïve girl or a mischievous one.