If you understand that every ruling class puts its stamp on all subsections of their societies, then you understand why the US ruling class has been using educational institutions to indoctrinate students to believe their version of history. This is especially true when their schools teach about massive war crimes as described in this article.
Americans suffer from a misinformation campaign initially perpetrated by the Truman administration and carried on to this day by high school textbooks that continue to tell the story as if Hiroshima and Nagasaki were indispensible in ending the war and saving countless American lives. The historical record is clear, however. As President Dwight D. Eisenhower said, “It wasn't necessary to hit them with that awful thing."