My sister was livid when she found out one of her high school daughters was shown the movie "Glory" as a reward for the class being quiet and cooperative during a previous lesson.
"It's an R-Rated movie!", she shrieked.
I explained to her that it was a movie about black soldiers in the Civil War and the R rating was for the violence, which you are bound to encounter in a war movie. Otherwise, there was nothing objectionable about it.
You make a good point that, technically, the school shouldn't be a proper venue for films that have been rated as to recommend children under 17 not view it. However, I don't always agree with the ratings movies receive and "Glory" was one such movie. I've found myself far more offended by any number of PG and PG-13 movies than this particular R feature.
Actually, there is a school version of Glory that is G rated. I know, I’ve sat through it several times. It’s been edited for schools to cut out the gore and focus on the development of characters. Seems like the teacher should have looked into options before going to Blockbuster
Schools are not the proper venue for films, period. That’s why God created movie theaters.