Why didn't the government focus it's efforts more precisely?
The military rounded up all arabs instead of the ones who were from the same country as the leader they captured. It's more likely that the ones from the same country would know who this leader is and would be on his side. But they round up arabs from all over the world. That doesn't get real close to the truth and is really just sloppy.
If it were terrorists from say, Bosnia who were attacking America, and there was martial law, the military would round up people from Bosnia. Would they round up people from every country in Europe? Probably not. Or if it were say North Koreans. Would they round up every person from every Oriental country? Probably not. So why capture people from every arab country in the world, when they can focus there efforts much more tight on people from the particular places, that they would have come from in order to commit these acts?