however amazon needs to follow the laws of the country that they are distrubuting the works in, in this case the US.
in addition, since the kindle service is only available in the US, someone stating that a work can be sold to kindle users is at the very least strongly implying that it can be done under US law (and if the web site didn't state this explicitly before, I'm pretty sure that it has been changed to state that after this fiasco)