To arrive at the truth the teacher put forward a pertinent question for investigation. The Nazi Germans did portray Jews as evil and vile...all the teacher did was ask the students to investigate why that regime thought that...was there any truth in it? Was it valid? Was it just propoganda? Perfectly valid method of learning. No more vile or offensive than Atom bombs dropped on Japan.
Turkish warplanes attack PKK targets after soldier killed in attack (Reuters)
from the article: U.S. teacher's assignment to students: Explain why Jews are evil