Why Hate America??

[Ironside]

Basically if I can track it right it seems to have originated from the Monroe-doctrine, who can be summarized down to
"We Americans are a freedom-loving people who wants everyone to have it as good as possible, except if you're not American. Now, make me some cheap bananas or I'll send my new pal's death-squad on you."
I'm not sure if it differs much from the European actions at the time.

Up comes WWII and suddenly US is a main player on the wordscene and the evil reds is lurking in the shadows. So US continues to apply their old tactics, while Europe starts to shift away from it while slowly losing their reasons for applying it (the colonies). Unused to the finer aspects of diplomacy, US is also getting its might around when dealing with its allies by simply using its might. During the Cold War it works, but no one likes a bully, and those things last.

Around the time when the deep wound of the US is formed (this one I'm letting you figure out) the dissonance between the US and Europe is starting to be seen and the wound itself only deepens the rapture. But the US continues their policies until the wall falls. Suddenly US foregin policy is without purpose and at the same time their victory isn't celebrated, but they're met with "good the problem is removed, now get some decency or beat it" by it's allies.
And the US cannot understand why. Wasn't it their mighty beacon of freedom and democracy that saved the world from the red danger (built of the bodies of some country with some odd name that we screwed over and over again, uhm what are you talking about, you European?)?

The rapture has never really healed (although some have tried) and the current resident of the colourless rainbow has worked so well that a book on how to make countries friendly towards you would contain don't do as that "African guy" is doing. maybe I went a bit overboard with that sentence

So basically the rapture has reached new grounds, making people sound like uhm your daddy messed up more than mine, while not having the slightest idea on what is going on in the other guys mind.

My take on it, could be wrong as I haven't been studying the issue thoroughly.

As for New Orleans and Katrina, it's needed to be an extreme disaster for it to be considered to get massive outside help (think the Indian Ocean tsunami on both the help and the disaster), when it comes to any western country. Have you even heard of "Gudrun"?
And you did receive international help after Katrina.
One BBC link on it as example
IIRC, your goverment did infact turn down several offers the first few days.