If I own a business and hire someone, then his pay is [sometimes literally] coming out of my pocket. This gives me a strong incentive to pay my employees as little as possible. In return, my employees have the right to form a collective where they can (for example) all stop working at exactly the same time. The threat of that happening causes me to pay them more than (and pay myself less than) I otherwise would.
That's a crock! A business hires employees because their work product earns the company more than they're being payed. However, the business is in control of the financial state of the company, including what they pay their employees.
A single employee may have a legitimate claim that he is being underpayed relative to the value of his labor, but an unscrupulous employer may choose to terminate an employee who requests a raise, rather than raising his pay, even if the request is reasonable, affordable and equitable, especially in times of high unemployment, and that single employee may not have much leverage unless he has specific, unique critical skills.
Under such conditions, unions can provide employees with greater bargaining leverage. Unions also provide an effective way to communicate with management about other serious issues such as safety in the workplace and can provide good hands on feedback to improve productivity, employee morale and more that can save money for the company.
I'm not saying that all employers and all unions are good or bad, honest or dishonest, anything else beneficial or destructive. The point is, there are many benefits to having a good, effective and honest system of collective employee representation.
If every public worker gets a raise, then that doesn't impact the politicians' salaries. So the reasons for which unions exist don't apply to public workers anyway.
Sure... until you get ethical and moral turds like Scott Walker and Republican turd legislators in Wisconsin who unilaterally strip workers of their their rights, their benefits and their jobs by legislative fiat.
I don't know who you are, but your post is extremely uninformed and short sighted.