Because we all know... Europe is such a terrible place to live and work in, especially those Socialist countries like Denmark and the Netherlands!
I've lived in the US. I've lived in Europe. I've lived for 17 years in a place with non means-tested free healthcare, no guns, heavily subsidized housing and budget surpluses. And let me tell you, it's clear where the people are the least happy. It's clear which nations are on the downturn.