That's because the ultra-wealthy control the elections via unlimited campaign contributions, "independent" group spending, lobbying, providing lucrative jobs to ex-politicians, or even running for office themselves. Both of the major political parties are corrupted by money, just in different ways, different funding sources. The news media has also been centralized, monopolized, and increasingly, owned directly by billionaires.

The public sector doesn't work because it's been sabotaged by the private sector.