More. Not all of it, not most of it, not a dollar amount, not necessarily a percentage. Things don't simplify neatly in life.
But unless they had zero hand in creating it, they should certainly get more than zero benefit from it.
And they were in large measure forced to agree. Collective bargaining has largely been crippled by union busters, and the alternative is unemployment until you find someone willing to pay higher, or find another line of work. But to claim the employers did not have the advantage is a patent lie.
You failed to address one single point or provide a single, logical reason to support your stance, but that's not surprising because there isn't a single,
logical answer as to why they are entitled to someone else's earnings. It is nothing more than greed and envy, wanting more than what you agreed to; an entirely emotional stance from emotional people.
And I'm rolling with laughter at "forced to agree." No one forced anyone to do anything. If they don't like the job, they can find a different job or move elsewhere. "But my family is here!" Then you're making the choice to accept a job because of convenience to your family. "But there's no other XYZ jobs in my city!" Then move to a city that does have openings, or choose another industry. Simply put, the large, vast majority of those who can't find a job have failed at one of the most basic functions of life, whether it be in preparation, ability to perform, or execution.
Here is the REAL problem:
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects. -- Robert Heinlein
This is layman for what used to be known as the "Renaissance Man," the idea that a man should master multiple aspects of life, sports, and career capabilities; to be well-rounded and excel at everything, to be both a student and a teacher. College brats today want to specialize in
one thing and make enough money to support non-important, frivolous lifestyles. Life does not work like that.