What would be the dominant theme in the entire story of Romeo and Juliet?

I had to change the question a bit.  From "preferred," I
went with "dominant" because I think that you are looking for the theme that is most
present, one that could be more easily selected from Shakespeare's drama.  I think that
there are many themes that can be extracted from the play.  The link below might help in
this pursuit.  I think that there is a very strong theme evident on the Capulet side of
the drama.  The intense gap that exists between Juliet and her parents might speak to
the danger of what happens when parents do not listen or hear their children.  In Act
III, Sc. 5, the discussion that takes place is one that reflects parents seeking to
enforce their will on their child.  Shakespeare's exploration of the child and parent
theme is not necessarily new.  Yet, he does bring a new dimension to it in suggesting
that if parents do not have a close connection to their children, enforcement of
authority's desires upon them can only result in dangerous realities.  The bond between
parent and child is severed when this happens.  This is a very powerful theme that I see
in the drama and one that I find extremely compelling.