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But then I think we're describing very different phenomena. If a large portion of Trump's base have been hit hard economically then decision fatigue is the relevant problem: if they're having to decide whether to spend their last dollars heating the house or feeding their children, then they have little decision competence left for choosing who has the best economic policy (especially if one candidate just promises to make it all better).
If we're talking about Trump himself, then there are all manner of possibilities, but I'm not going to speculate because I'm not a fan of psychoanalysis, especially done remotely.
Are we talking about Trump or his supporters here?