The Civics lesson is that when the government enters into a contract with an individual that it cannot then decide later on that it doesn't liked the contract and legislate to undo it.
Why not?
There's this thing in the world called bankruptcy. It's a backdrop to contract negotiation. It basically says that if I make a contract with you that is so bad that you can't sustain the contract, you get to get out of honoring the contract.
Just because, 10, 15 or 20 years ago, a group of employees managed to convince a politician to give them a contract that no reasonable party could expect to be maintained doesn't mean that now, 20 years later, we can't say, "That was ridiculous. It's going to bankrupt the state and we have to undo it."
Illinois is a particularly good (bad?) example of this. Many years ago teachers convinced politicians to set up a state-paid teacher retirement system. And they put in things like a formula where the school districts pay into the system based on the salary of the teacher that year, but the retirement payments paid to the teachers (and administrators, superintendents and others are in the same plan) are based only on the highest-paid 4 years of each participants career.
I'll give to 15 seconds to figure out what happened.
That's right, unions and administrators all started negotiating contracts where the school district gave participants huge raises in the 4 years before their retirement. Didn't cost the school district much in retirement plan contributions (they're only paying the higher rate for the last 4 years of a 30-year career) and the participants get a huge benefit - a much larger pension for the remaining 20 to 40 years of their lives.... paid for by the state aka the taxpayers.
When you get down to it, it's just a short step away from a conspiracy to steal money from the taxpayers of the state, and at some point the taxpayers are going to put a stop to it.