Kim might be responsible?

There are unconfirmed reports that US intelligence believes Kim Jong-il is responsible for the attack on the Cheonan. It says that it is based on the internal dynamics of the state, rather than hard evidence, but they believe that the sinking was intended to help shore up the succession of Kim's son.

I don't buy the logic, but I'll admit to not having access to the same classified material. The idea is that standing up to the West will reestablish the strength of the Kim image, and help the son take power. Moreover, there is some evidence that Kim Jong-il congratulated the

If so, it might well make the Kims the dumbest dynasty on Earth. Would it be worth it to risk war with the greatest naval powers in the world, to insure that your son takes the throne?