Concerning success, how would you rate a bomber that sees he's going to get found out at an x-ray station and ignites his bomb then? Was he a success?
Bruce Schneier, the security expert, sees two areas in which terrorism of th9s sort can be thwarted: in intelligence operations, and in rescue operations. The rest, the TSA machinery, security cameras everywhere and no-fly databases are simply security theatre. They don't do much to actually increase security, though the c ameras do prove useful after the fact in apprehending the guilty. In any society, security theatre is always at odds with freedom, while intelligence work, while potentially a loss of freedom is nearly silent, and rescue work can even be inspiring to citizens. Is it a successful raid if five terrorists give up their lives and only three others are killed in a bomb attack, because of the excellence of the rescue work? This, after all, a war, I'm told.