Replace 'most' with 'a slender majority' if you want to retain the fig-leaf of objectivity and rationality that you seem to covet.
Politics is littered with examples of groups who were deceived into voting against their own self-interest. This isn't some kind of bizarre conspiracy - it's business as usual. It strikes me as more bizarre to pretend that democracy is some kind of idealized machine that extracts considered, rational decisions from large aggregates of people. It never was and never has been. It's simply the "least worst"[1] way of choosing our leaders.