Friar Lawerence agrees to marry the lovers mainly because he believes that this will accomplish what? Marriage of Romeo and Juliet
He hopes by joining the families, he hopes that there will be peace between the Capulets and Montagues. He tells the audience:
In one respect I'll thy assistant be;
For this alliance may so happy prove,
To turn your households' rancour to pure love.
The feud between the two families
but in my opinion it would only make things worse.