On the #4, I have been a bit surprised there isn't a pretty simple gun system to target and shoot down drones just tracking them on their emissions. I assumed it must be harder than I thought.
Detection is easy, there are even handheld or pocket sized broad spectrum "hey there's a drone here" type devices hitting the battlefields now. There are also devices to listen into the video transmission (if unencrypted) so you can see where it is and is looking.
Shooting one down is trickier. You need either two linked DFing detectors with good separation, or some sort of active ranging device (RADAR, LIDAR, etc) than a guns, a powered turret, ammo source, and power source. It pretty quickly becomes a something that is vehicle mounted, or at least transported, which limits it's usefulness to the Infantry and lone armored vehicles that are the main targets of frontline FPV type drones.
Targets like that Russian ammo dump, or the Saudi Pipelines back in 2019 get autonomous drones with onboard targeting and position data, that are probably running dark RF wise, or a *very* narrow satcom transmission and so are harder to detect.
According to the Feds, all these mass shooters have explosive devices and made them using instructions on the internet.
That's true, and they totally would have worked, and exploded not just fizzled, and were less than ~500 gram payload capacity that consumer drones have. Nobody tested one, but trust them, those plans off the internet are good!
I'm half convinced that the FBI said the Butler shooter's IED would have worked because they were the FBI's plans, posted to entrap someone.
Don't get me wrong, I'm not saying drones aren't a threat, or that they could never be weaponized for assasinations. As a Soldier who doctrine has hanging out within 10km of the Forward Edge of the Battle Area, drones and their emerging useage and doctrine terrify me. But in the context of Lone Crazy Assassian in CONUS, there's some steep challenges.
