EDIT: Let’s cool it with the downvotes, dudes. We’re not out to cut funding to your black hole detection chamber or revoke the degrees of chiropractors just because a couple of us don’t believe in it, okay? Chill out, participate with the prompt and continue with having a nice day. I’m sure almost everybody has something to add.
Why? If you don’t have a bias against new particles. Why is a hole in one theory more likely than a hole in another?
Why should it?
Indeed, people think dark matter is motivated by observations disagreeing with theory in one consistent way, but it’s actually a case of observation showing a large distribution of invisible mass.
It’s tricky to do, as dark matter is non-interacting by nature. It will likely be a case of process of elimination.