Okinawans are split over the military issue. Some people want the US out. Others make tons of money off the Americans being there. It's not a clear cut situation as you seem to imply.

"Sure, it has popular opposition, but the capitalists like it, making it a divisive issue"

And lastly, WWII wasn't a war of conquest for the US. Blame the US for interfering in Korea and Vietnam and the middle east all you like, but Japan was a different story. Calling the US' actions in Japan "Imperialism" destroys any credibility you may have otherwise had.

Imperialism is not the same thing as conquest, and US handling of the aftermath of WWII featured cartoonish levels of imperialism, though the starkest example is probably Korea.