For me as a non astrophysicist, just another theory having a big hole was simply more likely.
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 shouldn’t it be broken elsewhere, too?
Why should it?
But I can easily accept the information given here, primarily the case with uneven distribution, which is a good case for something being there.
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.
Now you just have to nail the particle down.
It’s tricky to do, as dark matter is non-interacting by nature. It will likely be a case of process of elimination.