Cameron of course is not a Conservative so he gets a relatively free ride but the likes of Lord Mc Alpine and Thatcher are classic hate figures within the BBC and so are fair game as often as they can be brought onto the airwaves.
This would explain why Newsnight would have jumped at the chance to broadcast the story about Mc Alpine and why on the Jeremy Vine show on an item on who people burn on their bonfires we had the obligatory caller who said they always burn Thatcher.
What about those of us who would like to burn Blair or Brown - we never seem to get a mention!
The trouble with the BBC is that it has a left of centre bias in its DNA and is summarised brilliantly by James Delingpole here:-
Is the BBC toast? I wish!