After all, where else can public sector wages come from?
It also needs to be said that this is a common and despicable tactic of the right wing: first, vote consistently against any support for the public sector; then, claim that the public sector is fundamentally incapable of doing a good job (and should thus be deprioritized further), rather than it having been deliberately starved of funding and public support over the course of decades.
We have the public sector we vote for and are willing to pay for: no more, no less.