I think that if young people are going to watch movies/tv/etc, their parents have the obligation to investigate what they are watching and determine if appropriate.
A 7th grade BY girl watching movies can be depressing. BUT I am more depressed about the deceit of hidden tv’s, pretending not to watch, and the fake frumkeit. I’m sure some feel that if people know that they have a tv, that will hurt their shidduch status. But learning to be not yashar is far worse. Hacol bidai Shemayim (including shidduchim), chutz m’yirat shemayim.