Football: yes I agree that the police and intelligence services have shown themselves highly skilled at getting (and convicting) the wrong person several times when it comes to terrorism. I hope they have improved in the UK but I doubt it, this is from someone who was once held and (very ineptly) questioned at Paddington Green station - the anti-terrorism police base - I hasten to add I was of course innocent and was not tortured in any form (except listening to very stupid questions).
On the other hand I can sort of see Moving's point. Perhaps this is sitting on the fence and does not really solve the argument but....
I think the starting point should be that all forms of torture are inhumane, counter-productive and immoral. That should be the basis of any civilised country. Rules should be made and abided by. Where it becomes acceptable then you have a problem with that society as demonstrated by Climber's attitude. Given that as the starting point then perhaps in extreme individual cases some bending of the rules could be possible - but not as far as water-boarding for example. I can hear myself arguing against my own points - who decides what is an extreme case, who decides how far to bend the rules, etc.
Wishy washy arguing I know but it is how I feel.