John Oliver explores the seamy side of unregulated, unsupervised charter schools.

The charter school idea sounds good. They say they will “save” poor children from “failing public schools.” They say they will be “innovative” because of their autonomy. It is easy to make promises but hard to deliver on promises when 25 years have gone by without the miracle that was expected.

Supporters of public education have found it difficult to break through to the general public about the purpose of public schools (citizenship, not test scores), about the fact that charters select students and toss out the ones they don’t want, about the fact that charters drain students and resources from public schools.

John Oliver’s video about charter schools has been viewed more than 8 million times. That is the kind of public advocacy that the billionaires have not been able to buy.