Kadmom, I just watched the NYU Dorm video and it brought me to tears. I would definitely have a conversation with the teacher about that video and its emotional impact on middle school students-- regardless of whether they're skipped. I wouldn't wait for another poorly-chosen video to discuss the matter.
My son also loves SS this year. It's a wonderfully intellectually challenging class, so I understand why you don't want to rock the boat.
But think even if your child wasn't exceptionally sensitive, that video is too disturbing for middle school children-- especially when the girl starts shrieking about the second attack. I'm going to be thinking about it for the rest of the day.