If I were a communications and media scholar - which, as a matter of fact, I am - I would have this objective observation - love Fox News, hate Fox News, love NBC Network News, hate it, love O'Reilly, hate O'Reilly, love Brian Williams, hate him, whatever - under the LAW of the Federal Government of the United States of America, established in the Federal Communications Act of 1934, the United States Government, under the direction of the Federal Communications Commission, is obligated by LAW to hold the NBC News Network to a MUCH higher standard than which it's obligated to hold Fox News.
This is because NBC has broadcast affiliates - like, you don't need casble; you can still watch them with your rabbit ears and an HD converter and as established by the FCA of 1934 those affiliates themselves need to demonstrate they've been guardians of the public trust when they need to renew entitlement to continue to broadcast and get approval from the FCC.
So the network affiliates have a much more significant interest to remove Brian Williams from the NBC News Network for his bullshit, which gives NBC News Network a much more compelling reason to remove Brian Williams, than Fox has to remove Bill O'Reilly for his bullshit.
It's completely irrelevant whose whoppers were bigger, or if they're apples to apples - it matters not a wit - Brian Williams lies are a much much bigger deal than O'Reilly's are, simply because of who NBC News is as compared to who Fox News is, in the eyes of the law.
And that is just the plain objective truth.