I though I made clear - those who stay do so for the pension, security, and because they enjoy the job. The labour market is more complex than people swapping jobs just because the headline salary is higher, but the overall trend is that we are losing people to the private sector.
You wouldn't argue that nursing conditions must be fine if 'only' 50% of them left. What about teachers - they may be leaving in their droves, but some are staying, so their conditions must be okay too?
The fact is, as a country, we need good quality, skilled people to work in (for example) the government regulators as well as in the regulated private industries. There are also some services that can only really be provided by the government, and we need people to do those jobs. Everyone complains when their passport doesn't come on time, don't they?
Not everyone is driven by money, but there does come a tipping point where you stop being able to recruit and the public service collapses. That is starting to be seen in many areas right now.
It may be that the recession and cost of living crisis shifts things, but recessions are not good for workers regardless of the sector they are in. The end result is usually a loss of pay and detriment to conditions across the board, as competition for jobs increase and it becomes an employers' market.
Personally, I oppose the increase in the gig economy and insecure shitty jobs - I don't want a race to the bottom, I want everyone to earn decent wages. The average working person in this country is significantly worse off than they were 15 or 20 years ago - we need to work out how to address that.