Unions are distributional coalitions. They try to allocate more resources to their members than they would receive otherwise. The source for this surplus is the rest of society. In other words, they are cartels. It should not be surprising that some of them are managed by organised crime.
Be it through negotiating salaries or restricting the number of doctors or enforcing very difficult admission procedures for lawyers.
They tend to also effect other, non-zero-sum game advantages, or otherwise they would probably be outlawed, but this is the gist of it. You can still acknowledge that many were founded with good intentions, but people who do not see at least some downsides have a severe reasoning defect.
Be it through negotiating salaries or restricting the number of doctors or enforcing very difficult admission procedures for lawyers.
They tend to also effect other, non-zero-sum game advantages, or otherwise they would probably be outlawed, but this is the gist of it. You can still acknowledge that many were founded with good intentions, but people who do not see at least some downsides have a severe reasoning defect.