I don’t think that’s true at all. Your middle class percentage is tiny compared to most of Europe, and while you also earn a bit more, that money goes to a much stronger social safety net in most of Europe, too (at least in our more successful countries).

I would also wager that middle class workers are more comfortable here, because of guaranteed 5-7 weeks holiday, 37 hour work weeks (for the vast majority), guaranteed parental leave, and just generally a very unionized job market.