My two DCs have both had several English lessons on the topic of persuasive writing in both primary and secondary school. These have focussed on persuasive techniques, but every time they have been told it's fine to make up some statistics or facts to strengthen their argument, presumably on the grounds that it's an English lesson, not a science lesson or a lesson on critical thinking.
But surely critical thinking should be at the heart of everything our children learn at school? If it's ok for future journalists, politicians, bloggers and advertising copywriters to make up persuasive stats in their English essays, then can we really be confident they will ever unlearn that?