What is the importance of the Ghost Dance in the book, Flight: A Novel?

Justice begins to slowly convince Zits that they need to enact the Ghost Dance, a mystical dance that will bring back the spirits of many dead Indians (31-32). However, in Justice's personally twisted mindset, the Ghost Dance involves violently and cruelly shooting innocent people at a downtown Seattle bank. Over the course of the novel, the grudges and revenges of the past -- alluded to by the ancient nature of the Ghost Dance -- will come to be seen as a cycle that should be aspired to be broken.