The way you have to trigger moral thoughts is in a very subtle way — to not be too powerful to drive these two types of effects that I just mentioned.
Good example of an exception -- Back to the Beach (1980s reunion movie). I did *NOT* want to see that film. Some friends and I went to see the latest Bond film (can't recall what it was) but it was sold out. They decided to see this and I didn't drive. Everything told me that this movie would be crap. I'm embarrassed to say I enjoyed it. The opening on the airliner set the tone and it was just fun to watch. My "rules" told me to avoid this film like the plague.