It was his interference that led to Mercutio’s death. "Why the devil came you between us? I was hurt under / your arm"(III, i,102-103). Shortly after, in a rage that would cause his banishment, Romeo lashed out at Tybalt and killed him saying, "Tybalt, that an hour / Hath been my cousin. O sweet Juliet! / Thy beauty has made me effeminate, / And in my temper soften'd valour's steel(III, i,112-115)!” Romeo and Juliet's marriage has caused Mercutio and Tybalt's deaths, and Romeo's banishment. Friar Laurence was the instigator of all these woeful events; he started the tragedies by marrying Romeo and Juliet. It would have been better if Romeo and Juliet had not known Friar Laurence at all.
His desperate attempts for a quick resolution, and carelessness in doing so led to Romeo’s and
Juliet's deaths. He admitted his responsibility himself: “Miscarried by my fault, let my old life / Be sacrific'd, some hour before this time, / Unto the rigour of severest law” (V,iii,266-268). Not only were Friar Laurence’s plan and his foolishness, but his motives are also called into question. Friar Laurence did not want to marry Juliet to Paris when she was already married to Romeo. Juliet questioned Friar Laurence's intentions herself, saying,
“What if it be a poison, which the friar / Subtly hath minister'd to have me dead, / Lest