Trump isn't quite an anti-vaxxer. In fact, Trump is a slow vaxxer, which means he accepts the idea of vaccination, but he thinks kids get too many vaccines, too early in life. In practice, this means parents pick their own vaccine schedule, scientific standards be damned. If you are struggling to understand the appeal of Donald Trump—as I have been for months—his vaccine position offers a window. Trump occupies a middle ground between fact and fiction. For people who can't distinguish between the two, this compromise is irresistible.