People believe what they want to believe, and the US media apparently wants to believe that Japanese public support for the Hatoyama government plummetted because Mr. Hatoyama rejected US domination of Japanese foreign affairs policies.
How about reading the Japanese newspapers? How about talking to real people who live in Japan?
What Japanese people are rejecting is fiscal irresponsibility and a leader who backs down on public promises. You cannot run a country without treating the people's money with respect and still expect them to support you. You cannot do with promises what Lucy does with Charlie Brown's football: make people believe what you say you will do, then do the opposite.
It is very sad that a country that cannot go even ten years without engaging in multiple wars thinks it is in charge of a country that engages in peace for centuries at a time and is still in mourning for its last military adventure.