What does Steinbeck achieve by shifting tot he second person at the end of the chapter?

Steinbeck switches to the second person narrator at the end of Chapter 14 in order to give us a different perpective of what's happening. He does this throughout the novel in order to change perspective and voice. At the end of this chapter we find that the danger that faced by the family becomes more than one that attfects their family unit alone; it's an awakening that the people's problems have moved from "I" to "we."