"Everyone knows that there are things that you just do not say about the host newspaper, the owner, the editor, the advertisers, the government, the government’s allies. BBC journalists know what they should and should not say about Israel."
...
"Consider, for example, that it is an unwritten rule of corporate reporting that very ugly motives cannot be imputed to our government or its leading allies. They may err and blunder, but it is unthinkable that they would kill thousands, or millions, of people because it was in the best interests of elite power. It is unthinkable that they would deliberately kill the poor to terrorise other poor people to accept poverty. It is unthinkable that they would actively seek to promote violent conflicts because they have a monopoly on violence. It is unthinkable that they would seek to create enemies because doing so has multiple benefits in pacifying the domestic population, justifying arms budgets, and providing a rationale for attacking poor people overseas".

These quotes are from a piece on Mick Hall's blog (link), ex Medialens.