The assessment that the world didn't like the US… ever… is a faulty one. In general the German populace was incredibly grateful to the Americans. I grew up in a family, where both my mother and my father would have starved to death, if it hadn't been for the Care packages. If it hadn't been for the soldiers who… just helped, despite the fact they should have had any reason to hate them.
Now, when I served in the Army, I served under US command, and again, there was a level of trust in those people who put their ass on the line for us for over 40 years at that time.
I specifically went to get a Fulbright Scholarship to study in the US, to learn from there… and here's the moment when I had a rather rude awakening. Not only did the majority of grad students not know anything about world affairs or their own history (other than: we sure kicked your asses in WW2, hahahaha), they also DIDN'T care. There were few who were incredibly literate, understood history, art, whatever… but the majority – and this was a Journalism school, mind you – didn't give a damn. They did care about getting their face on TV, though. They did care about their new status symbols. But as to what they were reporting about? No a clue.
And that was in 96.
I went back to the US in 2001, and was there when 9/11 happened. And this was when it got REALLY scary. After the initial emotional outreach, which still moves me to this day, on 9/12, in an upper class bar, in St. Louis, the following was told to me: "You know? We should just nuke the entire middle east. F**king sand-niggers. Hey, you Euros need a parking lot? We can give you one for free".
And it was not just one guy, that was the sentiment in the room. Understandable anger? Sure. One could say that. Even though I find it interesting how you can insult two ethnic groupings at the same time.
But, being a history fanatic, I went back and tried to understand what happened. As in: "Why do they hate us?" Obviously, for the majority of the US populace at the time, it was enough to state: "They hate us for our freedoms". Yeah, say it again, Polly. Want a cracker?
Off you guys went, starting an incredibly stupid war, under false pretenses and… with and inepititude that boggled my mind even back then. I knew from my time in the Army and training with US soldiers that the actual WAR on a BATTLEFIELD, the US forces would be pretty much unbeatable by any other military in the world. But, here's the thing, and I told this to my US friends back in 2003… the Iraqis did exactly what I would have done. Exactly what I had been trained for in the event the Soviets would have taken West Germany. If you know you can't beat the forces in open battle, you let them roll over you. Wait. And kill them one by one. I just couldn't understand, still cannot understand how ANYBODY with a military background wouldn't know that.
And now Iran. The mess in Iran, the rule of the Mullahs is YOUR fault. Again, history lesson here. 1953. The CIA ousts a democratically elected secular government, invents a throne and puts a tyrant on it they call the Shah. Why? So that BP comes into existence. That turned into what the CIA calls a blowback and the Mullahs get into power. So what do you do? You prep up "New Hitler (1)" (Saddam) in order to invade Iran and fight your war for you… and nobody in the US gives a damn. Nobody does. But just imagine yourself to be an Iranian. First, the US is responsible for a tyranny (they hate us for our Freedoms, you know), then they back the guy who attacks your country. And people in the US wonder WHY the Iranians are somewhat wary of you, especially after being put on the axis of evil? You wonder WHY the Iranians indubitably (I have no doubt about that, at least) are looking to go nuclear, if you look at what happened to the other two countries on that axis? Iraq? Didn't have nukes, got torn to pieces. North Korea? Has nukes, everybody is tip-toeing around them.
Then we add to it: Gitmo, Abu-Ghareib, Blackwater, wiretapping, suspension of Habeas Corpus…
What Americans need to understand is that esp. the European populace, we KNOW that e.g. Putin is a bastard and Russia is well on its way back into Soviet times (albeit in a fascist way) and that China is a slave state that doesn't give a damn about human rights. We know that. It doesn't surprise us.
But you? The US? In my country at least, the wariness is primarily based on disappointment. You were supposed to be better. You were supposed to be the guiding light. The City on the Hill. And you turned ugly and you turned mean and you did it wrapping yourself in the flag and the Cross.