I agree with you. As I said, I don't act on the feelings that I described, but I feel them intensely. That so many people, do act on their feelings, concerns me a great deal.
When people start acting on their feelings, words like epistemology are utterly useless. We can't use reason to combat emotions. When emotions overcome reason, we need to understand where those emotions came from in the first place. By offering my personal feelings about rural stereotyping, I'd hoped to illustrate the consequences of stereotyping.
That's why I think your comparison between the way Trump supporters feel and the OJ Simpson jurors felt is fair and useful. Reason failed OJ Simpson jurors and reason failed rural Americans and they responded to the emotional impact on them personally, with emotion driven behaviour.
The reasoning behind emotion driven behaviour is as simple as... If they knew how it felt, maybe they would stop doing it. Since nothing else worked, that's not a bad idea.