Many characters in Breaking Dawn believe that it's worth sacrificing their lives for what they believe. Jacob is prepared to fight against his own werewolf brothers because he believes that the Cullens are not his enemies. Many of Cullen friends are ready to die for their belief that the Cullens are innocent of breaking any of the Volturi laws. The werewolves are willing to sacrifice their lives to fight the Volturi, because they believe that it's their mission to protect their land and their loved ones from vampires. All of these characters' willingness to sacrifice themselves make them noble as compared to the Volturi, who are mostly concerned with power.