Psychological analysis on literary characters

It is a seed for me to read the original edition of Hamlet later, though it is awkward to confess that my life experience resulted in the gap between my understanding of the object - the work Hamlet - itself, and the meaning of the tragedy.

From the chapter, we can know that plenty of previous literary critics traditionally interpreted the behaviors of Hamlet based on life-experiences and human nature. However, Vygotsky tried to analyze it from the play itself, such as the process of the author's creation, the structure of tragedy (elements of contradiction), and its re-creation in staging.

I would not agree with the research that trying to draw psychological conclusions from imaginary characters is scientific. Any analysis cannot escape the condition that being restricted by one's experiences. What's the difference between interpreting empirical evidences and artistic works? What's the point of analyzing them? Is there a commonplace of those lines of research?

Then I recall my experience of reading lot of movie comments or character analysis every time I finished watching a movie. I will also try to write my own. One of the main reasons that drove me to do this is that I hope to understand people in the story, and re-reflect it in my own life experience someday. Therefore, any contradictories and incompatibility would help build up logical lines in the table of humanity.