Would you not want to be able to sue liars and make some money off of it?
Discussion
But the liars would be decided by the rules of the state. In this case i reckon it would enable propaganda more than ever.
No, due diligence would be decided by the rules of the state; which would be simply the definition of the type of warranty you as a reader would have on the product/text, the moment a journalist would self declare to provide such a warranty.