Romeo and Juliet
Who's to blame for their death?
Evidence #1 - Romeo and Juliet's wedding
During this scene, Friar agrees to wed Romeo and Juliet, although he knows he's not supposed to. He knows that both families are fighting together and them being together isn't the best idea. The reason why he marries them is because he thinks that them being married will end or lessen the dispute.
Evidence #2 - Friar's plan
This scene is when Juliet goes to Friar for advise. Her parents arranged a marriage for her and Paris and she is very reluctant. She cries to Friar about it and he thought of an idea. He made a vial for her that would put her to sleep through the wedding. Because of this, everyone thinks Juliet is dead, including Romeo, which causes him to commit suicide.