penalty be allowed?*]{}. Likert responses were recorded on a -5 to 5 slider scale with 0.01 degrees of precision, with labels on the slider of “Yes", “No", or “Neutral".

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: & Proponents, identifying themselves as pro-choice, contend that abortion is a right that should not be limited by governmental or religious authority, and which outweighs any right claimed for an embryo or fetus. They argue that pregnant women will resort to unsafe illegal abortions if there is no legal option.\
: & Opponents, identifying themselves as pro-life, assert that personhood begins at conception, and therefore abortion is the immoral killing of an innocent human being. They say abortion inflicts suffering on the unborn child, and that it is unfair to allow abortion when couples who cannot biologically conceive are waiting to adopt.\

Our goal is to compare the belief change that results from social-media dialogs with the belief change from professionally-curated monologs. We selected the balanced, monologic, argument summaries from the website [ProCon.org]{} (in Table \[death-procon\] with an additional example in Table \[abortion-procon\]). The arguments from [ProCon.org]{} are very high quality, and produced by domain experts.

After probing initial beliefs, we presented participants with one of the three different 