I don’t want to take DHS’s side, and we all see the nefarious purposes of such vehicles. They should have the posse comitatus act shoved down their throats.
But, what if DHS has decided that they are going to be unable to protect America’s cities to the extent that massive upheaval, in the face of forced mass evacuations are necessary? Let’s face it, we are grossly unprepared to have a dozen of our cities “dirty nuked” simultaneously. What if Iran, or some other terrorist entity came through Mexico with dozens of dirty radiological devices, and detonated several devices in a dozen of our largest cities? The resulting casualties from just the panic to get out would be massive. Of course the economic costs would devastate our already sick economy. I don’t have a good feeling about a civilian agency having such weaponry, but does it really matter, if they are already planning to violate the posse comitatus act, openly? I am not sure of the armour on these MRAP’s, but armor does provide some level of protection against radiation, especially the kind you would expect from a dirty nuke attack.
Hate to disillusion you but Posse Comitatus is no more. as for the jihadis getting “dozens” of Radiological “dirty” bombs the bozos of DHS aren’t ready to deal with just one such devise. The problem is that they are designed & organized as a paramilitary organization / domestic army of occupation not a civil defense organization.