You can. We have a complete reductionist account for how computers work. We know there's no magic. We don't have such an account for the human brain, and it's hard to see how any explanation of brain function could account for consciousness (i.e. subjective experience). The most likely explanation in my opinion is that consciousness is a fundamental property of the universe that our minds have evolved to tap into.

Don't ask people to prove a negative.

That's rather the point.