Surely in a world where lawsuits can be brought against anyone, blaming them for any misfortune, we can now understand that blame is not an objective concept, nor a particularly useful one. It is quite possible to build a case that EVERY SINGLE PERSON IN THE PLAY is to blame for Romeo and Juliet's deaths, as follows.
Juliet, she shouldn't have taken up with a man who hangs around her backyard trying to peek into her window, but should have listened to her parents. She should not have gone along with Friar Lawrence's crazy scheme, or pushed him into proposing it. Romeo, He shouldn't have poisoned himself just because Juliet is dead. His committing suicide drove Juliet to committing