After the comparison between king Hamlet and Claudius, Hamlet starts analyzing his mothers actions. He underlines that she isn't still young , so she should control better his feelings. In fact in his son opinion she behaved like a teen, which falls in love very easily. Her judgment is considered wrong and crazy, because of the rule she has. She must have senses, but even if she could have been crazy, she should have recognized she was wrong;  her behavior is unbelievable, that just a devil would own it. In the end Hamlet gives the reader an image of the hell, the place his mother would reach after death. At that time people were very religious and believe in hell and paradise, so the image can be considered also like a warning to avoid incest.