Maybe it's just me but I remember back in the 1980's the first simulations of galaxies didn't work unless you added a lot more matter than was known even then to exist. That said to me that there is an unknown... of some sort. Because we're not even talking relativistic effects really. I have no dog in all of this because I'm supremely confident I would understand it even if the problem proves tractable. (And it might not be, for instance maybe dark matter just does not interact with normal matter at all)
Getting po'd at the media for not being able to explain stuff that scientists don't understand, might as well yell at a jellyfish.
Getting po'd at the media for not being able to explain stuff that scientists don't understand, might as well yell at a jellyfish.