That is to say, the administration is testing the extent to which the DHS (and other executive agencies) can act and ignore orders from the other branches of government. This is as serious as it can possibly get: all of the arguments about whether order X or Y is unconstitutional mean nothing if elements of the government are executing them and the courts are being ignored.
What the people I interviewed were drawn to was not necessarily the particulars of these theories. It was the deep story underlying them — an account of life as it feels to them. Some such account underlies all beliefs, right or left, I think. The deep story of the right goes like this: