> charter schools don't serve special needs students. More than that, charter schools bias towards engaged and interested parents. Because of policies like No Child Left Behind, it is really bad for local neighborhood schools to have all of their high performing students leave for charter schools.

- Charter schools take money away from neighborhood public schools. Most schools are funded per-capita, so fewer students means less money. But many costs are fixed/discrete (e.g. school nurse costs N thousand dollars).

- Charter schools have inflated performance metrics. Often charter schools don't serve special needs students. More than that, charter schools bias towards engaged and interested parents. Because of policies like No Child Left Behind, it is really bad for local neighborhood schools to have all of their high performing students leave for charter schools.

- Corporatization is evil. Charter schools often run more like a business than a socialized institution. Some even pay kids for good grades. Often, the success of a charter school depends on marketing, and successful marketing depends on performing well on metrics. Charter schools are then incentivized to "teach to the test" and potentially force out students who don't perform well. "When a measure becomes a target, it ceases to be a good measure."