But this particular, specific named individual was on a list of suspect individuals. Must we wait until a specific attack is attempted, or succeeds, before any pre-emptive action can be taken? Apparently the answer is “Yes!”
I am not familiar with the list in question...are you?
There are people on the 'no-fly' list that do not belong there and have difficulty getting removed. If this list is one level below, it is probably rife with mistakes.