I didn't say that. There is certainly not a single rational argument, there can be many going different ways. I also didn't call anyone a dummy. If someone's choice is not to present any arguments that can be evaluated by some means I just don't have a way of making progress. But I guess we are not bridging the gap here.

EDIT: and to answer your question emotion and rationality are separated by coming from different places in the brain. I can be mad, or upset, or happy, or in love, without any rational reason. There's not a love=mc^2 equation. But just because I'm mad doesn't mean that gravity doesn't exist. I don't know if this makes any sense but that's my best answer.

EDIT2: Or maybe you're asking how I can tell whether a given position originates from belief, emotion, or rationality? Well, I can't. I'm certainly willing to engage in the discussion and entertain the possibility that erecting trade barriers between the US and the rest of the world will improve in some way something for those people in the US who are feeling hurt by globalization. Convince me. So far what I heard is "we'll bring those jobs back" not followed by any specific actions or explaining how those jobs will come back.