Neoliberalism--the opening of markets and borders--enables capital to effortlessly crush labor. The social democrats, in embracing open borders, have institutionalized an open immigration that shreds the scarcity value of domestic labor in favor of lower cost immigrant labor that serves capital's desire for lower costs.

That's where the backlash is coming from, and that's why so many upper income people can't see any problem with it. It's the old old problem of the landed gentry and the nobility looking down their noses at all of those stinking whining peasants, all over again.