How far would you take this, though? What standard of evidence would you require for someone to be "fair game"?
This is especially pertinent in the case of the Israeli-Palestinian conflict, where the word "terrorist" is used by some in a manner essentially synonymous with "Palestinian".
I have a friend who spent time in an Israeli prison as a supposed "terrorist". His crime: "taking part in a political demonstration while Palestinian". Would it be okay to kill him?
What about someone who merely considered taking part but did not end up going? Still okay?
At what point do you become a "terrorist"? Is pre-emptive action okay? If so: how far do your plans have to be advanced for it to be legitimate to take you out? Detailed plan? Rough idea? Intention? When you decide, in principle, that it is - vice versa - generally speaking defensible to "take those fuckers out"?
Because: you yourself have actually arrived at the last point - and since I suspect you would not be okay with being labelled dangerous and approved for summary execution, you might wish to more clearly define when someone becomes a target.