Oh, yeah, absolutely. Another commenter on this post suggested my belief on it was from an Oatmeal comic. That prompted me to search it out, and seeing it spelled out again sort of opened up the memory for me.

The class was a sociology class about 20 years ago, and the professor was talking about cognitive dissonance as it relates to folks choosing whether or not they wanted to adopt the beliefs of another group. I don’t think he got into how to actually challenge beliefs in a constructive way, since he was discussing how seemingly small rifts can turn into big disagreements between social groups, but subsequent life experience and a lot of good articles about folks working with radicals to reform their beliefs confirm exactly what you commented.