Earlier quoted context omitted.
Private corporations no longer offer pension (i.e. defined benefit) plans, so if employees want a pension it's going to be managed by a union, assuming they even have a union. That's probably for the better because these days (as opposed to 70 years ago), unions will be far more responsible managers of a pension fund than corporations, partly because of stricter government oversight. Some other countries have nationa…
Unions have more hard power in the US. More control. Stuff like 'everyone who works has to be union'. Only X job can do Y. And Unions seek to increase their control as a defense against companies trying to take it back. European (dutch specifically) Unions have soft power. The only real control they have is declaring a strike. Everything else is bargaining for better terms of employment. The underlying trick is that…
So-called closed shops haven't been legal in the U.S. for 75 years, and union shops for over 35 years. What you're probably thinking of are compulsory agency fees, which admittedly have escalated to as much as 1/3 to 2/3 of full union dues. Full union dues are typically 1%-3% of wages. (According to the Teamsters website, full monthly dues are 2.5 times hourly wages, which IIUC is 1.5%, assuming 40 hours per week and 50 weeks per year.)
But the Netherlands have mandatory Works Councils for any company with 50 or more employees, and the company is required to pay all the expenses, including legal and litigation expenses of the councils. So it's functionally the same thing, except the cost is hidden from the employee.
Granted, the relationship between management and workers is much less hostile in Europe, so transactional costs are presumably substantially less. I wouldn't be surprised (but can't find numbers) if Works Councils budgets or comparable budgets for equivalent union representation are much less in Europe. But I also imagine the wage premium that union power in general provides European workers, whether workers are in a union or not, is substantially greater than in the U.S., so overall "costs" (i.e. surplus value shifting) incurred by corporations would be greater.
Because management has always been so hostile to unions in the U.S., unions certainly have had to fight harder, and there's consequently more friction and acrimony. But it doesn't seem particularly fair to place that blame only on unions. IMO, management is much more culpable in that regard, but from a third-party observers' perspective one could easily simply chalk it up to American culture (and especially business and work culture) in general.