the thing with Okinawa is actually a fairly controversial issue in Japan, a lot of people want it gone, but a lot of people want it to stay. most of the complaints about it stem from the jurisdictional situation, every now and then there'll be some wingnut solder or just some jackass moron who get's into a jrunken car wreck killing some people or goes out and rapes and/or kills someone and they will fall under the US UCMJ rather than the local Okinawan law, and no mater the outcome the fact that they won't be able to try the individual for crimes committed against them leads to resentment (not to mention the guy getting off a lot). however a lot of people like the income they get from the bases, and some people do consider it good to have the base there as a deterrent (China would probably be the biggest enemy, but a lot of Japan's neighbors still hold a lot of resentment about what they did in WW2)