[unpopular42]

> they created $900 in value

No. The company had created this value. If it was just the employee, I invite the employee to try quitting and creating this value without the company. It is bound to fail.

The rest is invalidated by this faulty assumption in the beginning.

> Fine

I can't say I read 100% of this. But it seems to show: - Unions claim to be beneficial. What a surprise - U.S. Democratic party claims unions, who give them a lot of money are beneficial. Another surprise! - Some authors rely on correlation to claim causation. Good luck.

> Please show me some sources that show unions hurt employees.

Have a look at your own links, for instance the last one. Reduced competitiveness of the business is bad for employees. Reduced income inequality is bad for everyone who is willing to work hard. Massive corruption. Waste of money and resources on nonproductive activities. Difficulties firing people who don't perform. Do I need to go on?