The nordics are anywhere from 50% - 90% of all labor unionized and they absolutely destroy the US on every standard of living metric.
It seems to me a case that echoes “better to let 99 guilty men go free than to execute an innocent man”. Of course, in this case, the ratios are actually reversed. Should we execute 99 innocent men to make sure that 1 guilty guy gets punished?
There will be some free riders, just like there will be some welfare queens, just like there will be some voter fraud.
That said, these cases represent a vanishingly small minority of the whole, and the cure is far worse than the disease.