Not an Argument against Vouchers
According to Mother Jones, school vouchers have paid for textbooks that Mother Jones readers disagree with. On the other hand, I regard the claims in their examples 7, 8, 9, 13, and 14 as plausible.
Even if you accept the claim that the examples are idiotic (I agree on example 11), if they didn't have a voucher system each school district in Louisiana would be one election away from fundamentalists taking over. There's also the minor problem that government schools also teach absurd stuff (back-up evidence seen here) and fail to correct left-wing fallacies.
There's an even bigger problem: When all schools are run by one organization, everybody will be making the same mistakes. When schools are run by many different organizations, any fallacies stuffed in “young skulls full of mush” can be corrected after graduation by people who learned better.