Dear @ghostdancer, the Overton window concept doesn't explain why this shift of opinions happen.
If you're old enough, maybe you'll remember that a huge shift happened after the fall of the Berlin Wall, when all the dominant media jointly fabricated the artificial consensus that the neoliberalism is the only valid thought.
And that all other political forms of thought are dinosaurian.
@hgfernan The Overton window is the name of the effect not the reason, the reason IMHO it's been a manipulation through the media the last 40 years, they've been heating the water slowly turning people every time farther to the right, it was first in USA and then exported to Europe cause the social democracies made USA not looking good and they need them to be dismantled for the sake of profits. @Jmb158
@hgfernan I'm European so we probably have seen the same. Reagan and Thatcher were the promoters of this trend and emptied traditional conservative ideology of content and replaced it. @Jmb158