Blaming schools or the education system for the totally unacceptable numbers of illiterates and innumerates it released into socuety is exactly the same as blaming factories and the motor industry for the appaling build quality of BL cars in the '70s and '80s.
Lousy cars are not built by an industry or a factory, they are built by shonky, slovenly workers who take no pride in their job.
The same is true of illiterate schoolkids. They are not educated by a system or a school, they are 'educated' - or not - by teachers.