The US isn't fighting terror. Terrorist attacks haven't diminished at all - in fact they have increased. There hence must be some other explanation for what US policies are trying to acheive or an admission that the war on terror is a failiure.
That's not entirely fair. It is perfectly concievable that the US can be fighting terrorism and the terrorist attacks would still be increasing. Arguably there could have been even more terrorist attacks if the US wasn't fighting its war on terror.
Their efforts can be considered insufficient but you cannot say for certain that they are ineffective or even counter-productive.