Donald Trump keeps making promises that experts don’t think he can possibly fulfill. It might seem that he has people fooled by his implausible claims, which include pledges to make Mexico pay for a border wall and to bring manufacturing jobs back to the United States. The psychologist David Dunning, for instance, has suggested that many voters are backing Mr. Trump because they lack the expertise to recognize his mistakes.

But in some news reports, his supporters sound more realistic about what Mr. Trump, the presumptive G.O.P. nominee, could accomplish as president. One voter told The Washington Post: “I mean, a physical wall? It’s just such a strong vision and idea, but I just care about the border being secure.”

Similarly, NPR interviewed a retired steelworker who conceded that his industry’s jobs were probably gone forever, but said of Mr. Trump, “If he accomplishes 10 percent of what he says he’s going to do, then that’s 10 percent more than anybody else is going to do.”