“This is a government power that should absolutely be outlawed in American airspace.”
You will note that the ARGUS demonstration was made over Quantico VA, just down the Potomac River from Wash DC and right over the Marine Corps base, so ARGUS is already in US airspace as of this 2011 demonstration and probably earlier.
I strongly expect that the inauguration this week was covered by an ARGUS drone (maybe several)...and some armed Predator drones as well that would have been piloted by a dedicated Secret Service detail. This is “merely” an extension of the sniper protection of the POTUS to a third dimension. I also expect that POTUS has Predator and ARGUS coverage in place for all US appearances around the US and probably in many foreign appearances as well.
This same logic that I suspect has already brought armed drones into US airspace will inevitably bring armed drones to local law enforcement as part of SWAT teams.
FYI drone ping...