I think that from the optic of someone who is not a physicist (like myself!) it's natural to think "hey... we can't actually know that it's dark matter vs some other unexplained way that gravity works". And in fact there are many physicists working on trying to figure that out, but there is actually a ton of evidence that what we're seeing is in fact particles, and most physicists consider it to be the most likely current theory. I don't think anyone in the physics community treats anything about dark matter as a given either (or hawking radation for that matter). In fact part of being a true scientist is keeping an open mind.
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