>In a regular employee-employer relations there is a big difference in negotiating power.
Not necessarily, it depends on the state of the labor market. You remember a few years ago when the Valley was incredibly hot. Workers had a lot of negotiating power despite being non-unionized.
All Swedish comments here from both immigrants and locals shows them apparently enjoying the unions' work and the backpressure put on the companies. Which is the point of any agreement: I give you my work under my conditions, you pay me under your conditions, and both sides must meet somewhere in the middle. And lo it's even done without government involvement - we talk about negotiations between unions and the company. So although your intention was to be against the union, you're basically making their same point.
In a regular employee-employer relations there is a big difference in negotiating power. Unions can mitigate that.