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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.
But here’s the catch: Without common sense as a guide, metaphysics is hobbled as an enterprise. You can’t do an empirical study, for example, to determine whether there really is a material world out there or whether everything is instead just ideas in our minds coordinated by god. You can’t do an empirical study to determine whether there really exist an infinite number of universes with different laws of physics, entirely out of causal contact with our own. We’re stuck with common sense, plausibility arguments, and theoretical elegance – and none of these should rightly be regarded as decisive on such matters, whenever there are several very different and yet attractive contender positions, as there always are.
I conclude that regarding the fundamental structure of the universe in general and the mind-body relation in particular something that seems crazy must be true, but we have no way to know what the truth is among a variety of crazy possibilities. I call this position “crazyism”.Source: Eric Schwitzgebel, philosophy prof at UC Riverside in "The Splintered Skeptic", interview at http://www.3ammagazine.com/3am/the-splintered-skeptic/