How likely would a mandatory pre-abortion ultrasound be to change a woman's mind?

A Salon headline yesterday read Being forced to view an ultrasound doesn’t change women’s decisions about abortion, asserting the results of a study on the topic. It argued that after viewing an ultrasound 98.4% of women chose to proceed with an abortion. However, I think that the conclusions miss some key bits. See my emphasis here in an excerpt from the Salon article:

Researchers reviewed nearly 16,000 visits to a provider where women were given the option to view their ultrasound image before going forward with an abortion. While a majority chose not to look, women did opt to view the sonogram a little over 40 percent of the time. Among the women who elected to view the image, 98.4 percent still went forward with the abortion. (Ninety nine percent of the women who did not view the ultrasound went forward with the procedure.)

It seems to me that the optional nature of viewing is likely to highly distort the results. i.e. It seems likely that two categories of women would likely want to view an ultrasound of their baby: those who didn't want to abort the baby (and hence who wouldn't be at an abortion clinic in the first place), and those who might be curious but simply didn't really care a whole lot about whether the baby looked human or not - their decision had already been made.

Compare to how large-scale agriculture has managed to get bans on recording animal cruelty into law. Why do you think they'd do so if, along the lines of what's outlined above this wouldn't actually change consumer opinions?

I suppose this kind of invokes Godwin's law, but the denazification policies in which civilians and military personell were forced to view concentration camps and face their victims seem another very appropriate parallel. I recently watched the German film Lore which spoke of how in order to get bread from distribution centres people were required to spend some hours looking through photos from these facilities. Do you think this was likely to change the views of the German population? If not, why do you think the allies would have done so?