Biting the hand that fed (or feeds) you - why independence does not exist but objectivity might

The newspapers reported Sir Alex Ferguson moaning about the power of TV. The sort of remark you make when untouchable and close to retirement. Now as we know (at least prior to the sale of Cristiano Ronaldo) that the Sky deals are probably responsible for Sir Alex’s big wages. However, he is not the only one. Financial services was or is full of such people. The obvious ones, presumably also with millions, such as Lords Myners and Turner seem to be forever critical of the City.
This brings me on to the more important point, Is it possible to be independent in a review of any aspect of financial services without being totally ignorant of it? The answer is no, This begs the question that if you review decision making then it makes you attractive for your next role in the private or public sector, could this influence your judgement. Politically, this was levelled at Neil Kinnock as he, his wife and family have clambered aboard the Euro gravy train (written with a degree of envy or is that jealousy) and has changed his anti-Europe stance from all those years ago.
Now, as regulators can also grab jobs in the private sector (with possible gardening leave or sabbaticals prior to the new role) this begs the question CAN YOU TRUST THE INDEPENDENCE OF JUDGEMENT OF SOMEONE WHO NEEDS TO WORK? Also, are regulators paid enough and knowledgeable enough? Bribing poor people is much easier!
Objectivity can exist.