It has to do with what I said. It has to do with what the post was about.
I agree with that.
However, when I say, "I don't believe in Bigfoot," I am asserting that, as far as I'm concerned, I believe there are none. That's just English as I learned it.
It is simply to say that my beliefs lie elsewhere than with the stated belief that there are Bigfoot. My beliefs, which compose the world I know, lie with a world that does not include Bigfoot in it.
Actually, basic logic includes three possibilities: "Figuratively, a proposition
A divides the agent's knowledge or belief base into three mutually exclusive and jointly exhaustive parts: a part that speaks in favor of
A, a part that speaks against
A (i.e., in favor of
W \
A), and a part that neither speaks in favor of nor against
A." (
Formal Representations of Belief (Stanford Encyclopedia of Philosophy)