you will find many thread about grounding in this sight, yes this should be grounded and that grounding in this case appears simple.run a ground line from the dish to the electric box. As for my self, I will not move a working dish, it doesnt make sense, I will not remove bolts from a roof for any reason, I will be held responsible for any bolt in the roof even if I did not put it there so why make more holes in your roof. If the dish needs to be upgraded I will install a new mount and bring it up to spec.
As to the grounding issue, back some time it was an auto fail, no ground the installer could be backcharged for the entire install. Now it is not, and the reason is money, Almost NO apartment or multi family home can be correctly grounded, so do you think that Dish would pass up all the people who live in MFD's. I have done hundreds of MFD's and for the most part have had no problems, I think the part failure is the same for persons with Grnds as with out.
Dish like many companys is about taking as little responsibility for there product as possible, the ground is one of these in some part. NEC who directs and suggests the codes is part of the fire codes. So what dish is doing is saying since there is no grnd, if your house has a fire they cannot be held responsable.