Unions can be an easy target to focus on for blame - despite the fact that historically they were often formed for solid reasons of protection.
I'm certain that in times where sharecroppers in the South - be it black or white - were not treated fairly (i.e. overworked without compensation, changing wages, etc.) and formed unions to protect themselves from being exploited, the ones making money off of them complained that they were hurting the economy the business contributed to....and yet it was never asked if a business should continue giving what was claimed to be contributions when the contributions themselves came through unjust means.
We see similar things when others complain of others not doing their job even though they were exploited in their jobs and no one said anything since others benefited from the product - with slavery in the Chocolate Industry being one example amongst many others involving others who people have suggested come together/resist the institution: