1. Friar is most to blame by marrying them to quickly, advancing with his plan too quickly and running away instead of helping Juliet. Also of his statement:
"But come, young waverer, come, go with me / In one respect I'll thy assistant be" and "And if thou darest, I'll give thee remedy."
2. Tybalt is responsible also because his insistence on fighting Romeo is what got Romeo banished and led to his death. Tybalt was so caught up in his family feud that he did not think about the consequences. Romeo was not interested in fighting, he consider Tybalt family.
