Harm of Ignorance

The very first day of my history class I tell the story of how Hitler convinced Germany that:

Jews were responsible for everything he did not like, including modern art, pornography and prostitution. Hitler also alleged that the Jews had been responsible for losing the First World War. Hitler also claimed that Jews, who were only about 1% of the population, were slowly taking over the country.

Perhaps I should also mention the harm of American ignorance:

But false belief in weapons of mass-destruction led the United States to a trillion-dollar war. And trust in rising home value as a truism as reliable as a sunrise was a major contributor to the catastrophic collapse of the economy. At its worst extreme, a culture of misinformation can produce something like Iran, which is run by a Holocaust denier.