Syag
i assumed “That” reffered to the situation ie condeming thousands upon thosands to people to death becasue of the (valid) concern that a small minority of them are terrorists.
The reason being that “I don’t think anyone believes that all the security will ever be in place” which even if true (though all anti-terror agencies disagree with your assesment)is a horrible horrible situation that you should have a very big problem with.
I’m sorry if you were reffering to something else