So perhaps it should be renamed to "dark force" (or something not so ridiculous-sounding) so as to not make it sound as if it describes an actual physical thing (i.e. "matter" which has mass and occupies space.) While this seems to express some of the qualities of matter (gravitation) we haven't actually seen or recreated it as in antimatter.

Shouldn't we absolutely, unequivocally prove that dark matter exists before positing the existence of a particle that explains it?