Not All Homeless Are Uneducated
According to Kozol, the character Kim was educated and articulate, and she was often interviewed by visiting researchers. Kim was a preschool teacher and living in a buliding that she was working to restore. She was working to provide for her children.
I think this is true from my own personally experience with the homeless. I know many people in my neighborhood that had pretty good educations, but made the wrong choices in life and ended up homeless. Kim was doing what she needed to do but because of the things that happened while she was repairing the building she and her children were left homeless, and had no where to go.