The current work provides evidence for a psychological obstacle to the resolution of divisive social issues (e.g., affirmative action, drug legalization); specifically, people approach discussions of these issues with a threatened mind-set. Across three studies, it is shown that the prospect of discussing topics which divide social opinion is associated with threatened responding (the dissensus effect). Divisive discussion topics are associated with both a greater level of self-reported threat (Studies 1 and 3) and a greater tendency to perceive neutral faces as threatening (Study 2). Furthermore, the effect is shown to be robust across manipulations of social opinion (ratings of multiple social issues in Studies 1 and 2; fictional polling data in Study 3), and was not reducible to individual attitude extremity (Studies 1 and 3) or a valence effect (Study 2).