Many compalins ignore the costs of missing these services.
We have 'free' firefighters because entire cities used to burn to the ground. That's very expensive to rebuild.
We have 'free' sanitation becauae The Black Death did more economic damage than both world wars combined.
We have free school education because having a population that can't read and write is economically ruinous. And politically ruinous - illiterate people can vote, join cults, maybe they support the inquisition and burning witches at the stake. We've been thought that.
No-one i ever met believes we should go back to the times where majority couldn't read and write becauae parents could not afford school. Some just believe that education stops at an arbitrary age.