The terrorists did get up, go to work, cared for their child, cleaned the house, did laundry, shopped, went to restaurants, and lived an apparently normal life. So how would you have spotted them as a threat?
Oh so when the next door neighbors wondered why they were working in the garage late at night and all the windows were boarded up, that’s normal????
Who has all their windows boarded up so people can’t see in or out??? Normal people??? I don’t think so....
And ‘grandma’ lived there and knew what was going on, so that’s NORMAL????.....