Expanding Upon a Point

See the middle paragraph on page 60 in Spayde's essay, "Learning in the Key of Life."  He begins by saying "There is no divide in American life that hurts more than the one between those we consider well educated and those who are poorly or inadequately schooled.  Talking about education is usually the closest we get to talking about class; and no wonder--education, like class, is about power."  But he goes beyond (he expands upon) this point about education and power in the rest of the paragraph. 

Ask yourself two questions:

1.    In what way is the second part of the paragraph an expansion of the first part.

2.    Is the paragraph stronger because of the expansion, or is it simply longer?  Explain your reasoning?