Who is at fault?
Who is at most fault: Friar Lawrence
Friar says, "To turn your households' rancor to pure love."(1.3.92)
The meaning behind this is that Friar is agreeing to marry Romeo and Juliet but only because he thinks that then their families conflicts will disappear.Reason 2:
Friar says, "Till holy church incorporate two in one."(4.1.94)
Friar agrees to marry them.
Friar states, "And this distilling liquor drink thou off."(3.5.37)
He gives Juliet a drink to put her to sleep but she won't be breathing and she will look dead. Her family will find her and bury her. Friar is sending a letter to Romeo to explain everything.