Agree with the first half. The snake oil salesman trope is an interesting comparison. I think the difference would be that communities tend to turn on the fraudsters once they have lost money and realise they can't get it back because they were defrauded (or occasionally the story will be they discover the ruse just in time and turn the tables and trick the fraudster). Whereas communities who have been left behind and are frustrated, scared and desperate still believe in the fraudsters because they haven't lost anything from it, and dont see how they would lose anything from it. For them, it still seems a risk free choice. Farage either magically solves all of their problems by reducing immigration, or he doesn't and nothing changes. But there's no immediate jeopardy of "our lives will be even worse if Farage is wrong".