The threat from terrorism may or may not be overstated.....even post London yesterday and I am from the UK, my view is considering the scale of the supposed threat there are relatively few successful terrorist attempts...Maybe because of good intelligence...On the other hand surely there is another way and better way other than turning flights back. Have any of these flights turned back ever found someone 'unsafe' on board???? If not...perhaps the queality of interpretation of information leaves something to be desired!