Do the powers-that-be need schools to falter in order to have a somewhere to place the blame for society's failings? J.M. Holland makes the case:
If politicians allow for poverty to destroy lives, then education can be expected to clean up the mess, and if it can't well then there is something wrong with education and it needs to be fixed. If politicians can't provide equal opportunities for all of its citizens through the job market then the schools can take a few licks if they can't make everybody above average.
Most of all, the "politics/business as usual" needs the whipping boy to stick around. It is vital that the whipping boy is available to take the punishment and the blame for the princes.