I don't think Right to Work laws are the problem. I see no issue with not forcing employees to join a union. If the union actually does a good job, employees should want to join the union*.
These concerns don't persuade me personally that Right to Work laws are bad. I'm just telling you they exist and probably have some validity.
I may have misunderstood what you meant though.
https://en.wikipedia.org/wiki/The_Logic_of_Collective_Action
The doublespeak "Right to Work" sabotages collective bargaining, disempowering Labor.