There are no observations of dark matter and few to none theories on how and why it exists. The only indication that it might exist is that our math doesn't accurately predict or simulate how celestial bodies are moving, there are other theoretical explanations such as a better understanding of gravity or a larger celestial mechanism just outside of the observable universe supplying an external force.

If you stipulate we must accept Dark Matter as the one true answer then you must also accept any hypothesis regardless of evidence, which is stupid.

TLDR: You're stupid.