I'll try and illustrate the real world with an example. A couple of years ago a friend of mine was in a graduate engineering role. The small company he was with was experiencing trouble and asked him to take a pay cut of several thousand pounds. Of course he didn't like it, but he accepted, knowing full well that in the employment market, with a surplus of people with his skills and at his level, he was lucky to have a job anyway. The company survuived, he's still with them and is recovering his salary as they can afford it.
Of course, he could have stuck to his guns, pointed to his contract and continued to pick up his original salary for a couple of months more until the company went under.
Now try telling that story again, but substitute "small company" for "heavily indebted, deeply troubled country" and "graduate engineer" for "unskilled administrator/cleaner/immigration form filler outer" etc.
I know there are many worthy, and some underpaid, people in the public sector. I would never belitte the contribution of the (front-line) emergency services. Unfortunately, it's all the much-more-easily-replaceable people that constitute the waste of resources. And it's those people who should be embarrassed and ashamed about kicking up a fuss.