PC would be the least of my concerns. That is the AG's problem. 
Hawks are good birds. What they trade in toughness they get back in making it a 3D battle with vertical envelopement a real threat. They too can be armed for a worst case scenario.
MRAPs don't have the intimidation of MBTs but they would add a deceptive element. One would assume a mass of oncoming MRAPs are fully loaded and so can disguise the true number of agents.
Drones would be strict Intel as offensive use on US soil would give everyone fits. Of course the media need not be told they are unarmed.
Biggest issue IMO is the FBI. I am not impressed by their tactical prowess. Federal Marshals otoh are better than most believe. A multi-agency force with military advisers would have the greatest chance of success if a solid COC can be hammered out.
I agree with your analysis of BLM. Hubris is far too prevalent in many federal LEO agencies.
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