Why is it important for Dally to fight in the rumble?

Dally feels it is important to fight in the rumble to prove his loyalty to his friends and to assert his place within the gang. The rumble represents not just a physical confrontation, but also a means to defend their identity and honor as greasers. Additionally, for Dally, engaging in the fight is a way to channel his frustrations and feelings of powerlessness in a society that often marginalizes him. Ultimately, it underscores his desire for validation and belonging among his peers.