I'm not worried about mind control either but I'm still not 100% certain that I would not walk out of a movie because of its message, whether real, or inferred by me.
That's commerce.
I understand, but I am a pretty combative person, so maybe that's part of it--I like to hear everything the other side has in its rhetorical arsenal, and then my mind goes to work countering each point. So for me to sit in a movie and be repelled by the theme would activate my combative side. I enjoy reading and seeing things which are NOT "on my side" more than I do reading stuff that just says to me "You're so right."