I think you may have the Scotch-Irish, at least the ones living around Scotland and Ireland wrong. They have never been particularly fascist and I have not noticed them being unusually xenophobic. In the recent Brexit vote it was the English who voted out, not the Scots or Irish.
Exactly. For some reason, colonies preserve the cultures that settled them, while their homeland counterparts continue to change. The Scotch-Irish of 300 years ago, who still live in the US today, are profoundly different from the modern Scotch-Irish -- and for some reason have never adapted to an environment of peace and security.
(Possibly because the US is less peaceful and secure... but part of that is perception, and/or a product of people expecting it to be.)
