Some unions have and some of them have not. I'm retired from a union that as you say provides training, support, benefits, and generally makes the working environment better. This is one union that has set the standard for other unions throughout the country. I could have worked in the trade non union but the workmanship, benifits and general environment stunk. People would always call us to fix the garbage work others did. Unions certinally are not perfect but I couldn't see myself at Walmart. In the final analysis the free market and unions both have their place and benifit the worker.
I hate hearing about mdk5623 problems and the loss of his livelyhood and i especially find it disturbing that the union didn't do a better job of represanting the members. I'm hoping for a measure of success for him in the very near future.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….