I say if the mall (or anywhere else) allows them, then take them...if they don't allow them, then don't.
I like my dogs, and all Yorkies, but I understand why and agree with stores and public establishments not allowing them and when that's the case, I think the policy should be followed. Not all dogs are UTD on vaccinations, not all dogs are well groomed and behaved. Kind of hard to draw the line and allow some and restrict the others.