Anonomoose-
What you say is true-minimal argument there. However, my class is now in session.
Unions came about for the reasons you cited, and they were necessary to curb worker abuse and to create the new middle class in America. However, unions became strong because America was growing its manufacturing base in the 1950s as soldiers came home, started families, bought houses, and purchased cars and appliances. This was the start of the "baby boom". This gave rise to a large scale manufacturing buildup in the great lakes rust belt as companies built plants in Flint and Detroit, mills in Pittsburgh and Gary, and farm equipment in Racine and Moline. America, so rich in resources, needed one critical item to make this happen, and that was a reliable workforce. Unions provided that reliability, employers responded with wages and benefits, and everyone made money. In the 1950's 35% of American workers were union.
Manufacturing in America is in severe retrenchment. America has a much reduced need for a high priced reliable workforce. Much of the work performed by that workforce is now automated, and rather than hiring workers to assemble and paint things, companies have robots to do the work. If the job is assembly line work, companies have it outsourced to China or build plants in Mexico. Unions now represent only 12% of the workforce, only 7.4% of non-government workers are union.
The laws of supply and demand dictate that the side with the supply must change price to meet demand, or the demand will go elsewhere. With 10% reported unemployment (18% estimated) the supply of workers far exceeds demand, and the cost of those workers must come down until supply and demand are in balance. If not, the demand will go elsewhere.
While America continues to work, we have become a service and consumer economy. Those industries have historically had low union membership, and large numbers of affordable workers have lowered the barrier to growth. Meanwhile our large manufacturing legacy companies continue to fail (GM) while their competitors with non union workforces in this country (Toyota) succeed.
Think about it...it is cheaper to build a TV in Taiwan, load it on a ship, sail it across the Pacific, unload it to a truck, take it to a rail yard, piggyback it to Chicago, unload it to a truck, and drive it to the WalMart distribution center near Eau Claire than to build it at the Zenith plant in Melrose Park and truck it to Eau Claire.
You are correct, unions were instrumental in the building of our middle class in the 1950s and 60s. Unfortunately, they were instrumental in the destruction of that middle class in the 1990s and 2000s by failing to respond to the changing world economy, and now the goose that laid the golden eggs is dead.
And now, class is dismissed.