By having the students come up with propaganda to persecute Jews is by no way freedom of thinking. It is a practice in hate and an attempt to hurt the Jewish kids. If the teacher wants to stand on a soap box on a street corner and yell at people about this he can, but he cannot try to teach hate to kids.
Mexico approves U.S. extradition warrant for fugitive kingpin 'El Chapo' (Reuters)
from the article: New York teacher suspended over Nazi simulation writing assignment