The biggest problem with your article is that its basic premise is flawed.
You completely rely on the "torture" issue in Iraq as the basis for your argument. Abuse of POWs happens in every war. Regardless of where, why, who, it always happens. The question is a matter of how much, not whether there is torture. I wouldn't be surprised if real torture (i.e. physical torture) occurred in Iraq, by Americans, that we don't know about. What we do know, however, is that this "torture" was essentially pre-interrogation intimidation. The POWs weren't physically tortured in any conventional sense. But even if they were, trying to use a single incident as the basis for why the US isn't benign is not reasonable.
I think we can all agree that war is bad. But I also think that you really should look into history a little more. For example, the fact that you use Vietnam as an example of the US doing a "Bad" thing is telling. Do you know what the Vietnam war was about? Do you know what happened in Vietnam and the region after the United States left? Do you not think the people of a given terriitory have the right to decide for themselves who would rule them?
In Iraq, for example, I would be perfectly happy to let the Iraqi people hold a referendum after June 30 (date of the turnover) and if they want the US out, the US should then leave. But it should be up to the people of the country to decide that.
And despite your flawed thesis, you didn't even prove your point. All you did was say the USA is bad as others. You also, again, have a serious blind spot for history. Germany has been in a bit more than a "colonisalist" war. Russia has done a bit more than just crack down on Tibet. China has done a bit more than just crack down on Tibet. And in none of those cases could they be considered "liberating" those countries. The people in Iraq have overwhelmingly said they are glad Saddam is gone. We can debate all day whether Iraq has been liberated or not (I think it's pretty obvious that the US was a liberating power - unless you're going to argue that the US is planning to say annex Iraq).
Any leading world power is going to be like a bull in a china shop. The qeustion is whether that power is relatively well behaved or not. And relatively speaking, since that is the only comparison we can do, the US has been pretty benign. Nothing you've written says differently.