The naive economist who truly believes in the equal bargaining position of labor and capital would find all of these things very puzzling.
One of my most astute economist friends once opened my mind to the obvious fact that unions are the result of workers having power rather than the cause. I say this is "obvious" because an organization is created by its constituents and not the other way around. It's easy to forget, when one is entangled in rhetoric that treats unionization as an independent optimization goal, that the proper goal of the economic planner is a balance of power between capital and labor.