I think the far more important point, however is that some charter schools are working phenomenally well for the underprivileged and doing so with less funding, and that there are valuable lessons to be learned from that fact, which lessons are at risk of being ignored or lost. However, instead of either trying to learn from these charter schools or allow more of them to be created, teacher's unions and the government officials they support via campaign funds are openly hostile to them, as the book details. These adults are clearly acting in their best interests, not in the interests of the children they are claiming to serve.
With regard to government policy in general, there seems to be a complete disincentive to analyze policy in retrospect honestly, determine successes and failures, and learn from the past in order to influence future decisions. With government policy, intent often matters more than results, as intent earns votes. This can easily lead to perverse incentives.
As an example, it's easy to claim good intent when proposing to spend more money on schools. But, if we want to actually help children out, results matter more than intent, and it seems very clear that, past a certain point, pouring more money into the public school system has little to no impact on educational outcomes. Instead, we should both be looking at other factors, and we should be allowing for more competition so that we can iterate on more ideas more rapidly. The relative monoculture of the public school system, combined with perverse incentives among both the government and teacher's unions, seem unhealthy for society and for our children.