Accepted ways of thinking on immigration, welfare and regulation are being debunked left, right and centre.
Wrong. Very few people I know thought immigration was anything other than an invasion. Only the media lied about it. Lies are not accepted ways of thinking. Lies are lies.
It used to be thought that mass migration was unambiguously good for the economy.
Lie. The media sold the public that lie. Only the feeble minded believed that lie.
I don't know anyone that actually believes that mass migration is good for any economy. There are multiple recorded events in history that shows the exact opposite and you only have to see the resource drain on the community / country to know that it is bad and the money should be used to deport and seal the borders.
However, that is not how you get a population that refuses to integrate, is hostile to the citizens and if given the chance will vote in communism.