However far fiction writers stray from their own lives and experiences - and I stray pretty far from mine - I think, ultimately, that we may be writing what we need to write in some way, albeit unconsciously.
I know that from the days of Watergate... the notion of two sources on a story has become the popular dogma about how you confirm something. And there is a lot of truth to that, but there are all kinds of ways to check to the extent that you can, a story that you get.