Unions not only supported union workers, but the standards and pay grades they established helped non Union workers as companies upped the pot to keep unions out
But republicans helped destroy the unions and collective bargaining. They established "right to work states" that meant a right to be paid less. They destroyed collective bargaining and the obligation to join unions in a union shop
How did Republicans help to destroy unions? Just because we didn't support the concept?
Your argument here is the same my father used on me years ago. He is a union man and kept telling me the same thing: Son, if it wasn't for us union people, you wouldn't be making the kind of money you make driving a truck today!
After about four or five times he laid that on me, I finally had to shut him up.
"Dad, if you didn't make so much money laying brick, I wouldn't have to work for the money I do today to afford the houses that you built!" That was the end of that argument.
Right to work states gave people the option of joining a union or not. Since many people didn't want to join the union, right to work gave people that ability not to be forced into a union they didn't want to belong to. Unions should have never had the right to force an industry to not hire somebody based on their union beliefs. And that was the other terrible thing about unions. They went from representing their workers to taking over the whole Fn company. They told the company who they could hire, who they could fire, who they were allowed to promote, who they were not allowed to promote. They got so strong that they just about ran the company; in most cases right into the ground.