"Notes on Hamlet"

One BIG thing that I've never noticed when I read this play is how naive Claudius is. He doesn't want to see what's right in front of him, he'd rather go about like everything's fine. But then when he knows that Hamlet is onto him, he changes tactics immediately, because up until then everything was going to be fine, he would rule and he would have Gertrude. He realizes how much of a threat Hamlet is so he finally does something about i by sending him to England, but I know this will not work out for him...