I wonder why journalists don't voluntarily to this? It seems obvious to me that high quality journalism should cite sources and methods, if only to protect themselves from future criticism if their news reporting turns out to be wrong. At least then they can point at the fault publicly, explain how it happened, and what they are changing to make sure it doesn't happen again.

In some cases, they might deliberately not want to give certain sources, but in that case I'd like them to explain their reasons as a footnote of each article.