They lost because it was a miscalculation on their part. But like I pointed to that Asia Times article that had little to do with elections but how this incident was going create epic change in the Far East in favor of South Korea.
Any one of them and more are capable of it. My money is in fact on some accident whether explosion or a Kursk-type incident and they just exploited it. No misunderstanding. Yeah I do believe Japan, even though I don't believe it in this case, and South Korea are very capable of creating a lie for some geo-political end. During the 80s all I heard by Americans was how Japan was plotting to take over and enslave the world but somehow this is far-fetched?
This is the prejudice I'm talking about. You think it unthinkable that Japan and South Korea would lie. Guess what? All their regional political maneuvering is about putting the US in between China and them. The US is a free army they don't have to pay for. Plenty of countries in the region playing up the China threat. Why? To curry economic and military favors. And again the US will defend them at no cost because they know they can exploit US paranoia over China. How many news articles do we read about how all of China's neighbors are nervous and need the US to protect them? You seem to keep avoiding the fact the number one expert on North Korea, Bill Ricahrdson, too believes countries will go to great extremes to impress the US as I pointed to his belief all of North Korea's antics... building nukes, threatening nukes, this incident... is all about crying for the US's help to save them from China. Someone can believe that but you don't think these people will cross the lines and sacrifice innocent lives? What was first an ego boost to think people will go to these extremes to impress the US now looks like arrogance in my context? People don't bring it up to Bill Richardson that it sounds like arrogance to believe that because it's a boost to the ego at first glance. It's someone like me that puts it into the proper context and no one likes it because it's true. So by Bill Richardson's own logic, who still is looked upon in the US as the leading North Korean expert, my charge that other countries in the region will go to extremes to impress the US is confirmed by him. If people disagree with him, then maybe someone should've called him out on it but they didn't because they liked what they heard from him.
You're starting at a conclusion and working backwards. You want to make this a manifestation of the "China threat" and you want to assume that I can't see the "grand truth". But I'm sorry, your contorted logic just doesn't work.
I don't care what Bill Richardson says. I don't care about what complex psychological motives you claim are at work here. What we have to ask is:
A) in a cost benefit analysis, is it reasonable that the South Korean government would fabricate an incident in the hopes that it would persuade the United States to increase it's defense commitment to North Korea
B) That the fabrication would be done in such a way that it would leave doubt (something you yourself have admitted)
C) That the South Korean government would try to deepen its cover by failing to directly link the sinking to North Korea and first trying to say it was an accident
I think the answer to these questions is no. Furthermore, there simply isn't a direct enough link between increased US commitment to South Korea and the Cheonan incident. What I'm trying to say is that if the SK government sank the Cheonan and blamed in North Korea, it opens a can of worms with very real possible negative immediate consequences. Increased US commitment to Korea and East Asia in general would only be a long-term consequence, and an indirect one at that. There's too many possibilities at play to have a neat cause-effect relationship like "Cheonan sinks -> SK doesn't have to pay for it's defense and US protects it from China". I'm having a hard time defining the concept I'm getting at but basically what I'm saying is that even if SK did sink the Cheonan there's no guarantee at all that it would have the grand geopolitical effects you are asserting it would.
Lastly I take issue with the assertion that South Korea wants to be protected from China so badly. I think you have a predisposition to see everyone as out to get China. If anything South Korea has been trying to walk a line between the US and China in recent years. It's been South Korean policy to take over more responsibility for their own defense.
Like Planeman said, conspiracy theories fail at the macro level.