[Morgeruat]

The problem with a terrorist to civilian ratio is that most terrorists purposefully blend into the civilian population, and when the civilians aid them in their disguises it becomes hairier.

Who would have called the London bombers terrorists two weeks before the attack? Who would have called the Madrid bombers terrorists two weeks before the attacks? With most terrorists you can't objectively tell without a significant amount of investigation, when you have neighborhoods aiding them, well in war all bets are off and they become terrorists themselves due to their actions.