When one cuts though all this technical complexity it all come down to how humans are hardwired. We are all hardwired to seek advantage at every opportunity, seeing our opportunities as fair and others as unfair.
The rich and powerful simply know how, using negative tribal impulses, to cause the poor to work against their own self-interest. For instance the GOP says, look you poor, White morons we are robbing you blind, while we have you all riled up about some caravan bearing down on America. Really the poor are poor because they are such easy marks because they can’t get past their xenophobia. This is Trump’s only talent — turning folks against each other for profit.