> Typically human hubris, why can't we recognize the most logical explanation for so much dark matter?

It's not hubris. It's rationality. If what you say is correct, we would probably see more evidence of alien life. You can't just see a star flicker and jump to aliens.

Why is that explanation much better than we're inside Matrix. And dark matter is rounding error or even worse our overlords manually tweaking parameters.

Both are untestable theories, which means they are essentially useless.