How can it be proven that in Romeo and Juliet, allegiances to different groups results in severe consequences?
I think that the best evidence that can be used to defend this thesis is to find situations where individuals acted in the name of allegiances. In these situations, the results were brutal consequences. For example, Lords Capulet and Montague act only with their alliances and allegiances in mind. This helps to further the rift and schism between both families. They act in the name of their allegiances, helping to ensure that there is no chance of reconciliation. This can even be seen in Romeo. When he acts with his allegiances in mind, he kills Tybalt, making him a marked man. When he did not act with specific allegiances in mind, he was able to represent a hope for peace. Yet, in the death of Mercutio, Romeo acts with his own allegiance in mind. The result is death. Juliet's parents in Act III, sc. 5 act with the allegiance toward their name in mind. The result of this action is the death of the bond between they and their daughter. Characters like the Nurse and Friar Lawrence do not act in the name of specific allegiances. They act with the children in mind and become the only source of hope and redemption in a setting where acting in the name of allegiances results in destruction and death.