Dichotomy

In the Pearl one of the techniques Steinback uses in Dichotomy. Dichotomy is any splitting of a whole into exactly two non-overlapping parts. In other words, it is a mutually exclusive bipartition of elements. i.e. nothing can belong simultaneously to both parts, and everything must belong to one part or the otherIn his book the Pearl there is a lot of Dichotomy. There's the contrast between Juana and Kino who are poor and ignorant and the doctor who is very smart and rich. There's the contrast between the natural good and the corrupt evil. Then things that seemed good such as the pearl turned out to be bad.
Is Steinback showing something that is really in natural life or is this just part of the parable?
I'm not sure. It's true that life is full of dichotomy like right and left, good and bad, love, hate and ignoring, true and false, but not everything that seems good is bad and not everything that seems bad is really good. I think that he used dichotomy to emphasize and teach us things that he couldn't otherwise, but I do also believe that in life there is dichotomy, though probably not as much as in the Pearl. What do you all think?