Actually, I think Korea's claim to the Liancourt Rocks is more solid than Japan's. It's just that Korea is tired of being the middle child that gets overlooked and kicked around. They are going to beat this issue to death because they want to win at least one victory against Japan in contemporary history. Korean culture sees itself as a victim, and they are like dog that's been kicked one too many times. They are desparate to get these damn rocks because it has become a symbol to them of their national pride. They'll do anything short of declare war to get them, no matter how underhanded.
I think the Japanese know this, so they are behaving much more moderately and diplomatically.
It still annoys me, though. Like I said, I think people should blow them up and then say, "Now nobody gets them."