In the case of the pro-choice people (whose camp I was firmly in before watching the movie, and in whose camp I remain afterward), the questions boil down to testimonials and expert opinions, as well as emotional appeals of their own. Experts are used to purport the idea that early-term fetuses are not people, and that the irreparable economic harm that would come to a welfare system that has more unwanted children than it can take care of. Emotional appeals are also used in the case of the mother, especially in the cases of rape and incest victims who people do not want to abort their children. After watching this documentary, it was clear to me that the pro-choice side of the issue - given Tony Kaye's relatively agenda-free direction and editing - was far more rational and compassionate toward the issue than the pro-life movement. Many of the pro-life people had an air of judgment about them, whether they were condemning those who abort to hell or implying that only products of immoral, sinful sexual relationships need abortions.
Kaye T., dir. (2006). Lake of Fire. ThinkFilm. Documentary.