Polling data shows us people who support Donald Trump are disproportionately more fearful than other Americans. Trump supporters are far more afraid, even if sometimes they don't know why.
The fear of unknown outsiders is central to Trump's campaign. Even though immigrants commit fewer crimes on average than other Americans do, Trump's most popular policy is a literal wall that he says will keep out foreigners and keep his supporters safe. Some perspective here: About 10,000 Americans die at the hands of drunk drivers every year, but these cases do not concern Donald Trump. He hasn't talked about them. What he is worried about is a single death, in which an undocumented immigrant was the person behind the wheel, and which Trump can't stop talking about it, as he did at the Republican National Convention.
And if you think Trump and his campaign team don't know the actual facts, well, you're wrong.