[mariksolo]

Collective bargaining is 100% better than individual bargaining.

But, collective bargaining is only a single aspect of unions. They're not voting against it because they dislike collective bargaining, but because of other reasons. Collective bargaining is likely not a significant motivator for them because their salaries really are fairly high for the area.

I think in many cases unions are good, and in many others they are bad. I disagree that you can point at overall data and use that decide a specific case. Union data likely has severe survivorship bias, since unions likely tend to exist where they are more helpful.