3:AM Magazine � The Splintered Skeptic: My suggestion is this: Common sense is incoherent in matters of metaphysics. There’s no way to develop an ambitious, broad-ranging, self-consistent metaphysical system without doing serious violence to common sense somewhere. It’s just impossible. Since common sense is an inconsistent system, you can’t respect it all. Every metaphysician will have to violate it somewhere.
Common sense is an acceptable guide to everyday practical interactions with the world. But there’s no reason to think it would be a good guide to the fundamental structure of the universe. Think about all the weirdness of quantum mechanics, all the weirdness of relativity theory. The more we learn about such things, the more it seems we’re forced to leave common sense behind. The same is probably true about metaphysics.