I shall attempt to explain further. Let us create a theoretical universe. In this universe, there are only 4 kinds of basic physical particles. An observer in this universe would consist of a number of these 4 particles in some collection and ratio. If this observer were to say that there exists a 5th type of fundamental particle, which in no way interacts with the other 4 at any time, and thus never interacts with the observer's universe, then the observer's statement can be called fictitious. That is since this particle, in the observer's theory, never interacts with the universe it can never affect any aspect of it. Therefore, from the point of view of the universe which the observer inhabits, this particle is fictitious and irrelevant.

This is the same premise I utilized. To say that anything which interacts with our universe exists and is therefore under the influence of every natural law. And that which does not interact in any fashion can be considered fictitious and irrelevant.

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The Capitalist maxim: The fortunate must not be restrained in the exercise of tyranny over the unfortunate. Bertrand Russell
Heroism on command, senseless violence, and all the loathsome nonsense that goes by the name of patriotism -how passionately I hate them! ~Albert Einstein