The problem is that most Leftists and many Europeans can no longer distinguish true friend from foe, good from evil. It doesn't matter how good the US is, they can't recognize it. It is kind of similar to the way that anti-Semitism is rapidly growing in Europe.
Unless trends reverse, I expect there will be major wars in Europe in our lifetime.
The problem is that most lefts and Europeans can no longer accept that the ends justify the means, and actually understand how the world works, that doing evil in the name of good (eg torturing suspected terrorists), cutailing civil liberties and cenralising power. Freedom has a huge price, many revolutions bloody civil wars in Europe are testemony to that. If we give away freedom for security, then getting it back again is going to have a very high price indeed. I guess you are from the US, you should go and read what the founding fathers wrote, they were a smart bunch.
"They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety" Ben Franlin
"The price of freedom is eternal vigilance" Thomas Jefferson.
The only people who can take away the Freedom in the US is the US government, so you have to watch what they do like a hawk, unfortunately the threat of terrorism, which we have lived with in Europe for decades (ETA, the IRA etc - note also the IRA were funded by weathly americans, in a similar way that AlQuida has been funded by wealthy Saudis)
Anti-semetism is growing in Europe because the Israeli right wing (and part of the current government) wants a greater Israel from the river Jorden to the sea. Unfortunately quite a few Palestinians live there and don't want to leave. So they think they can treat them like crap, kill thousands and eventually that will happen. In Europe we remember what it is like being a colonial power and taking over land that does not belong to you. America was built on taking someone elses land, which might explain the difference. We see the Israelis as the evil british empire, and the palestinians as the natives. You see settlers and indians.
Sorting out the Israel-Palestinain problem i probably the most effective thing that could be done to stop the terrorist threat against the US, that requires the US facing down the Israeli right wing, which is unfortuntely not going to happen.