Charter Schools, Public Funding, Tax Breaks and Privatization

The charter school movement is embodied in an attack on public school unionized teachers, and seeks to put publicly funded schools in private hands. A Stanford University study shows that 37% of charter schools deliver lower quality education to their students. Should we trust the motives of privatizers when it comes to educating our youth? They're in it for the tax breaks, government guarantees and the chance to make some more money, all with public dollars. 
http://www.truthdig.com/report/item/flunking_teachers_gives_the_ruling_class_a_pass_20110329/?utm_