Jonathan Evans - Head of MI5 -gave a speech last night talking about the terror threat in the UK.
Although amongst other things it would have just been his way of getting a message to the government not to cut back of the security budget when the cuts are announced, he did include this quote
In recent years we appear increasingly to have imported from the American media the assumption that terrorism is 100% preventable and any incident that is not prevented is seen as a culpable government failure.
This is a nonsensical way to consider terrorist risk and only plays into the hands of the terrorists themselves. Risk can be managed and reduced but it cannot realistically be abolished and if we delude ourselves that it can we are setting ourselves up for a nasty disappointment
IMO the biggest thing here is that this guy doesn't have to play politics, he can just tell it as it is