It isn't foolish to assume those things don't exist, it would just be foolish if we continued to do so after some evidence has been collected. Every stance in science is a temporary one. Able to be replaced with a superior stance at any moment in time. It is this ability, to change our mind, that separates the scientist from the theist. Inherent in this process is the idea that all positions are amenable to greater awareness. So there is no need to parse words and stress a mind that is able to be opened to new ideas. It is the fool that keeps that mind open in the shape of things for which no evidence may ever arise. The things for which there is no evidence do not exist. Including string theory and dark matter, I might add.