I don’t think it’s necessarily fear in all cases. It’s the WALL. The idea of a protectionist wall : some temporary measure to “circle the wagons” so the US can clean ourselves up before re-entering the global marketplace is appealing to people. It’s actually one of the things that people found appealing about Sanders.
Also, he’s a living Eric Cartman, which makes him funny to watch.
But overall, it shows that Rush Limbaugh is in his glory. I was stuck listening to him in the early 90s and thought he faded away but nope – he influenced a generation.