I submit that advocates of the pro-war position seem generally oblvious to the need to fulfill this test and thus fail Popper's falsifiability principle.

Here is the pro-war apporach to the Madrid Bombing and the question of terrorism in general:

Terrorism goes up? One argument for why the Iraq war/occupation was justified.

Terrorism goes down? One argument for why the Iraq war/occupation was justified.

I will admit that the pro-war folks have a lot of moxie. They use (or at least strongly imply) that the Madrid bombing provides an argument for why their side was right all along.

On the other hand, any fair advocate of the anti-war position would admit that the case against the war/occupation can be falsified. Thus....

Terrorism goes up? One argument for why the Iraq war/occupation was unjustfied.

Terrorism goes down? One argument for why the Iraq war/occupation was justified.

When will the pro-war side construct a set of arguments that can be tested by Karl Popper's falsifiability principle? In other words, when will they tell us how their position can be refuted? We are waiting.