Is it unfair to say that the complaints on these forums are almost exclusively about US abuses?
Can't speak for all, obviously, but I do understand your point, which I take to be "Why is everyone so riled up about the crappy things America is doing and seemingly not concerned about the crappy things the other side is doing?"
For me, it is not a matter of not being concerned about the barbaric things that a terrorist group does. Their actions are outrageous and should be condemned and punished. But I think in many ways the reason some of us are so vocal against the abuses on our side boils down to differences in expectations. I expect a terrorist to act like...a terrorist. I expect him to try and blow things up, or behead an innocent if he gets the chance. On the other hand, I expect better from my own country. I expect that if we, as a society, are to be taken seriously in condemning and combating terrorist behavior, then we can not act as terrorists ourselves. There are certain values that are very plainly evident in both the Declaration of Independance, and the Constitution. Two documents that I think we can agree are major pillars in the formation of the US and its "self-identity" if you will. Those documents are both very well reasoned, and clearly work to establish us as a nation of laws, and to eliminate abuses of governmental power and authority. Torture does not fit into that framework very well. Unlimited detention without charge doesn't either. Of course, I realize that non-citizens are not covered by those documents. However, for myself, I can not escape the thought that if we truly value freedom, justice, and equality under the law, then we have to apply those values to everyone equally. Even our enemies. That means, to me, it is no more right for a non-citizen to be held without charge, representation, or trial for 5 years, then it would be for me. That does not mean I think terrorists should be glibly released to cause more mayhem. It does mean I think they should be lawfully tried, the evidence against them presented, and a sentance passed. Vengence is an ugly thing. It allows for people to be assumed guilty because of what they look like or where they live. And when we allow ourselves to conduct our affairs that way, it makes us no different than the terrorists we claim to be saving the world against. But if we have to act like them to win, then ask yourself...who will save the world from us when this is over? The path to totalitarianism can be a remarkably short and smooth one. All it takes is a little fear, and a "leader" to take advantage of that fear, tell you who is to blame for it, and say "I can protect you, if you will allow me to." Ask the Germans.