The "context" of the movie, and what the movie "might" contain, and what people "might" think as the movie is playing, particularly as the movie isn't even out yet, is irrelevant to the aims of an ad. The ad seeks to show a message as pointedly and succinctly as possible (i.e. there can be no room for ambiguity. The handcuffs are there because it makes the meaning as clear as day).
Your response completely fails in refuting this.