I phrase things like this: the lack of real labor power through unions or ideally worker cooperatives leads to bad deals for workers. It would be in the interest of workers to build collective power and demand better compensation or start their own cooperatives to guarantee higher pay and benefits.

This has to be said because collective action necessarily requires convincing a lot of people to do it. But either way this language avoids the claim of right and wrong and simply focuses on the fact that workers today get a bad deal due to poor bargaining power.

It’s also not just about markets. The federal government places severe restrictions on what organized labor can do to advocate for itself: Labor Management Relations Act of 1947 Aka “Taft-Hartley Act” https://en.m.wikipedia.org/wiki/Taft–Hartley_Act