Trump voters may not vote the way I want them to, but, after having spent the last five years working in (and having grown up in) parts of the US few visit, I know they are not dumb. They are doing what all voters do: Trying to use their vote to better their particular situation (however they define that).
Labeling them dumb is simply a way of not trying to understand their situation, or what they value.
Related, Madison, despite spending nearly $18k per student annually, has long tolerated disastrous reading results and perpetual resistance of K-12 diversity.