This scene shows how Friar Lawrence´s thoughts and feelings could´ve somehow affected his choices.
Friar: Please make up and stop fighting
Montague: I hate you
This scene shows that Friar only agreed to marry both of them because it can benefit his plan on uniting the two families.
Kiss the bride
My parents want me to marry this boy named Paris but Romeo is my only love and he has been banished
Friar suggests the most reckless and dangerous plan to Juliet. He did not think about the dangers that this plan has and only considered the result.
Drink this potion that makes you look dead and run away with Romeo once you wake up
Send the letter to Romeo
After Friar Lawrence tells Juliet his plan, he sends a letter to Romeo and telling him off the plan but the invitation gets delayed because it was busy. If Friar really cared he shouldve sent multiple letters or delivered it himself to ensure the delivery.
In this scene it depicts how Friar kept telling Romeo and Juliet what to do. They cannot be blamed for their deaths because all they did was follow directions from Friar.