Funny how that works: China doesn’t want to restrain North Korea from attacking South Korea, but hates it when the U.S. Navy shows up on its front door. The Wall Street Journal passes along a sampling of Chinese reactions to the shelling of Yeonpyeong. Well-connected people I’ve spoken to seem convinced that there’s a segment within Chinese academia and government that really has had it with North Korea, but I doubt China will ever restrain North Korea without being subjected...