Times are tough for the Hatoyama Cabinet. It's had to backtrack on several campaign promises. Its approval ratings have plummeted to around 20 percent. And that old bone of contention — what to do about American military bases on Japanese soil — has resurfaced again.

The Okinawa Futenma base relocation issue is complicated, and Prime Minister Yukio Hatoyama has devoted too much time to a battle he simply cannot win. If the American troops stay as is, Okinawan protests will continue and rifts within the Cabinet will grow. If the troops are moved within Japan, excessive media attention will follow and generate more anti-Hatoyama and anti-American sentiment. If the troops leave Japan entirely, people will grumble about losing American money.

So let's ask the essential question: Why are U.S. bases still in Japan?