Agreed, since relatively clean and rigorous theories exist that require neither e.g. the so-called Modified Newtonian Dynamics. The "dark <foo>" theories are starting to look a lot like epicycles IMO -- convenient, but without good reason and lacking direct evidence.
as I said... I accept them, provisionally, with grumbles and discomfort and a deep yen to have samples of each bottled for direct analysis.
while math is a lovely tool, I remember the bumblebee error, so I really do prefer math *supported with empirical data* to math alone.