The reason why TR fills a vacuum is because he appeals to people’s fears and prejudices, is the oldest trick in the book, Trump and Farage do the same. They take a scapegoat that they know many people feel uneasy about and make it into a bogeyman that will steal their country and their jobs/women etc. This idea of a group of people taking over a country is not new, in 1930s Germany people were persuaded to feel that Jews were taking over the country, taking influential jobs, especially in finance.
In Southern states of the US before civil rights there were regular tropes about black people over populating the country, being over sexed and raping white women, and being more violent/savage.
We can see resonances with this and what TR, Farage, Trump and Musk are saying.
And they are not offering solutions just unrest, division, and violence. But people in times of trouble want to blame someone for their situation, especially when politicians are weak and incompetent.
These are dangerous and very dark times for this kind of far right nonsense never ends well.