Why the US Forces Should Withdraw from Japan?

So the US forces will be departing from Iraq and Afghanistan. It is because they have found that there are no enemies to fight any more in these countries(there were none in Iraq from the start). Hopefully it will create an atmosphere conducive to the cut in the size of the US forces in and around Japan also? They must have understood by now that there are so many US bases in Japan, and the people are suffering from the training exercises, breaking of the rules, accident, crime and so on? The common people of the US may not be aware of them, as yet, but surely the military must know them, and must be of the view that it's time that at least some of their forces should be withdrawn from Japan also, at least from Okinawa, with so much concentration of bases, unconditionally? That would surely be of great help in bringing about more peaceful atmosphere around Japan and the whole of Western Pacific? After all have not the US forces stationed in Japan much too long?
On 21 June, two days before Obama's withdrawal speech, and also two days before the bloody fighting in Okinawa finally came to an end sixty-six years ago, hence 23 June being a very memorable day particularly in Okinawa, the Foreign and Defense Ministers of Japan and the US met in Washington. This so-called two plus two is an institutionalized meeting between the two countries. They met for the first time in four years. They agreed that, contrary to the above expectation, the presence of the US forces in Japan has increased in importance in order to keep the deterrent capability based on the military alliance. There is not only nothing new here, but it is putting a cart before the horse.
The US forces have been using Japan and particularly Okinawa as a stepping-stone to be deployed further in Afghanistan and Iraq. Why is it that, when they are being withdrawn from those places, the two must talk about the increased importance of their presence? Deterrence is an age-old Cold War theory identifying an enemy and justifying more armament. Is it possible to find a new enemy for the war-weary world? A Colonel in Libya? And neither of the two are economically strong enough to talk of deterrence. The US should mind the next Presidential election which is almost round the corner, and Japan, needless to say, the recent disaster.
Even more startling is the agreement, which must have been reached with the full knowledge that the Okinawan people are almost unanimous in opposing it, that the Hutenma airbase should be moved to another place where a couple of runways, each 1,800 metre long, should be built in a V-shape by reclaiming from the sea rich in coral reef. It is 15 years that the decision was taken to move Hutenma elsewhere, an airbase most dangerous in the eye of the local inhabitants, but it is absolutely impossible to find an alternative. Together with the announcement that the notorious MV22 "Osprey" transport plane-cum-helicopters will come to Hutenma later in 2012, the withdrawal from Afghanistan is, for want of a strong will for peace, not going to make a positive impact on the atmosphere in East Asia.