why give your employer so much monopoly power over you?

Why would folks be so passionate to make sure that government is their primary employer-- giving huge monopoly (monopsony) power to entities that are often inept, sometimes corrupt, and almost always horrible with budgets?

When K-12 teachers work so hard to enhance their monopoly power over parents, students, and taxpayers (by opposing charters, vouchers, etc.), they are necessarily asking for the same power to be used against them.

Do they not understand this trade-off-- or they don't like it and are just doing what they can to tilt the trade-off in their direction?