Collective bargaining against private actors is fine. There should be no collective bargaining against the democratic will of the people, any more than some random group of federal workers has veto power over law passed bu congress. It is simply not how democracy works.
They don't have veto power over Congress, it's about allowing workers to dictate the terms they seem fair for themselves against the US government. If Congress and the executive branch can't agree with labor terms with workers at the table, that's bad.
Not having unionized federal workers is way way way worse.
One thing I am curious about, how do you feel about police unions?
Presumably this also rules out any company or non-profit from negotiating a contract with the government, or suing the state.
Having an executive with contempt for the law and the concept of separation of powers and judicial review is a perversion of democracy.
The democratic rule of the people is driven by the law. What laws have the republicans passed authorizing these actions?
That makes it easy for people to leave the government.
The question you should be asking is: are there enough people who are sufficiently competent to take on the government roles?
Case study where the workers had less power than expected: Reagan vs. air traffic controllers.
Case studies where the government had less power than expected: Every coup ever, UK's Winter of Discontent (even if the long-term result was electorate going for Thatcher who gutted the unions), Polish Solidarity Movement.