Who or what is most to blame for the tragedies that occur in Romeo and Juliet?

Who or what is most to blame for the tragedies that occur in Romeo and Juliet? Is it Romeo and/or Juliet themselves? Is it Mercutio and/or Tybalt? Is it Romeo and/or Juliet’s parents? Is it Friar Lawrence and/or the Nurse? Or is it societal expectations? Misogyny? Patriarchal society? Pick two aspects to focus on in your argument as your main argument and as your counterargument.