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"Let's say we live in "the matrix" and that there is _absolutely_ no way to get out of it or anything that could hint its existence. Given that assumption, what is the point of debating whether it exists or not ? Even if there really was a matrix, how could it be useful for us to know this piece of information ? That knowledge wouldn't serve any purpose as the said matrix wouldn't in any way interfere with our universe and even less with our mere human lives. Of course, if there was any way to escape the matrix or if it would even subtly interact with our universe, that would be another question."

The standard answer is that all of our naive beliefs about the world would be false. You are not actually sitting on a couch, your simulated body-projection is simulated to be sitting on a simulated couch. The very fact we can't tell whether or not we're in the matrix undermines all our knowledge.

The more insightful answer is that even if we're in the matrix, everything about the physical world is still true, there is just a metaphysical fact we are unaware of--namely, that the universe happens to be a simulation. You're still sitting on a couch, and the couch is still made of atoms, and the atoms are still made of subatomic particles and so forth, but it turns out all the subatomic particles are just data structures in the matrix and we didn't know that before. Nothing is undermined.

I assume this was meant to be a clarification as opposed to a counter-argument because I totally agree with you. My point was that there is absolutely no use in knowing "metaphysical facts" as long as they don't change anything about our knowledge of the physical universe.

Metaphysical facts are fundamentally unknowable anyway--if you could determine them through some type of experiment, they'd be physical facts. There might be some metaphysical facts you can prove by argument, but I doubt it.

You could even argue that metaphysical statements are meaningless, though you run into problems going too far that way as well.

Metaphysical statements are indeed meaningless if you can't determine them through some type of experiment. That being said, the fundamental laws of our universe could also be considered as metaphysical statements since they "describe the physical", the precise definition of "metaphysical". However, those metaphysical statements can be determined through experiments and that's why they're "useful".

@philwelch: I quoted you here http://syskall.com/why-we-should-eradicate-agnosticism-from-..., hope you don't mind. I tried contacting you by e-mail but it didn't work.

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