If you can't be bothered to take five minutes to inform yourself about their "targets", I don't know what to say. If you had, for example, checked their website, you would have noticed that their current activities pertain to: Darfur, Jordan, Jamaica, Syria. I really don't see where your allegations of anti-Americanism come from. Speaking up against Guantanamo is about the only recent case I can think of where the target was specifically the US. If that's enough for you to call them disgusting and anti-American, that says much more about yourself than it does about the AI.
And again: AI is a pressure group, not an army that could take direct action agains entities guilty of human rights abuses. Pressure works when there is someone to be pressured. People in the west care more about human rights and can therefore demand a better record from their governments. The government of Sudan apparently cares about them very little - still, something can be done by reporting the abuses and trying to persuade other governments to take some sort of action. Action is already being taken against al Qaeda - pointing out their human rights abuses serves absolutely nothing, as al Qaeda itself doesn't seem to be susceptible to pressure, while governments of other countries are already taking action against al Qaeda and don't need to be persuaded to do so.