This is an example of what happens when people's livelihood is tied to political posturing.
When government is the employer, employment questions become policy questions … and policy questions are intrinsically political questions. This means that all the players involved will mobilize political power to get the answers they want.
The problem isn’t the existence of a teachers’ union. The problem is on the other side of the negotiating table.
Read more at c4ss.org
Get government out of education, and the alleged rapaciousness of teachers’ unions is limited by the ability or inability of private employers to meet their demands (or their ability to generate revenue by forming their own cooperatives and serving willing customers).