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Also, have you considered that unions aren't greedy, but simply negotiating a fair value for their labor, and your mental model reacts negatively for some reason due?
The children working in gilded age coal mines were working in the best economy in the world and in the history of the world up to that point.
Isn't this the best time to do it? It seems like if workers did the opposite you'd be complaining that they were striking when conditions were bad and hurting the company!