It is tough to argue with much of what they say: They are looking to "save kids now." To open "real opportunities." To build "within the realities we have." And to argue with this is to engage in that oldest of battles among the colonized - do we achieve freedom and power on "their" terms, or "ours." Do we want our children to grow up as -and this will depend on the argument you are making - Brits and citizens of the world/Second-class Brits or to grow up as Nigerians, Indians, South Africans, Irish, Israelis/poor separatists in a global economy.
As with most great issues, the answers are not clear cut, not "black and white," as they say. We want our identities, we want freedom and possibility based in our culture, and yet, yes, we also live and work in a world designed and controlled by the powerful.
So when people like @dropoutnation argue for charters and vouchers as their "answer," it is not just a matter of being co-opted. They have convinced themselves that this is the only logical solution in the world they see now. And I can argue for greater faith in the future, for greater faith in diverse communities, but altering someone's fundamental world view is tough.