How does Loewen redress Wilson's and Keller's herofication?

From the text:

Two twentieth-century Americans provide case studies of heroification: Woodrow Wilson and Helen Keller. Wilson was unarguably an important president, and he receives extensive textbook coverage. Keller, on the other hand, was a “little person” who pushed through no legislation, changed the course of no scientific discipline, declared no war. Only one of the twelve history textbooks I surveyed includes her photograph. But teachers love to talk about Keller and often show audiovisual materials or recommend biographies that present her life as exemplary. All this attention ensures that students retain something about both of these historical figures, but they may be no better off for it. Heroification so distorts the lives of Keller and Wilson (and many others) that we cannot think straight about them.