Blame is always a tricky thing. “Brexit voters are so stupid … ”
Okay, now, who do we blame for them being so stupid? Why didn’t they heed the experts’ advice?
Um, maybe because there’s absolutely zero reason for them to believe that the “experts” have their interests at heart?
Because, as long as expertise / intelligence is not evenly distributed, people who are relatively “stupid” on some issue would rely on experts whom they feel they can trust.
So when no expert in the world is actively demonstrating any sort of concern for their well-being (after all, those experts are all enjoying their luxurious life while the poor people are suffering), the next best person to trust is those obnoxious, loud-mouthed demagogues who make a public show of being champions of justice.