Like when Tybalt kills Mercutio just because he was angry, then Romeo not being to able to control his impulse issues did not think about what he was about to do , and just ended up killing Tybalt. That is how Romeo ended up being banished . Or like when Juliet takes the poison to fake her death so her parents will think she is dead, but then Romeo found out that Juliet was dead not knowing that she was not actually dead went and took a poison that killed him, then Juliet woke up and killed herself by stabbing herself in the stomach with the knife that Romeo had with them after she had seen that Romeo was dead next to her. Sarah Jayne-Blakemore's thesis on adolescent brains and how teenagers prefrontal cortex are still developing , which is the part of the brain that is involved in decision making. Romeo and Juliet are still teenagers which explains why they took so many unnecessary risks that could have killed them and is also the reason why them both and 4 other people ended up