Sorry, but the mini suicide drone bots don't have the processing power or bandwidth to do this. I'm not even going to say "not yet". This is a much more difficult environment to work with than folks may think.
The connected society certainly has some challenges, but autonomous "slaughter bots" with little more than a photo hunting dissidents aren't one of them.
I imagine right now the Secret Service has techniques, equipment, and plans to deal with the potential of drone attacks on people under their watch.
It would be straightforward, for example, to equip, essentially, "hand grenades" to a fleet a "dumb" drones that act simply like guided missiles, and act as a "time on target" strike. No face rec or anything like that, sending a dozen small explosives to an outdoor podium.
However, this is a spectacularly sophisticated attack. It's very expensive. And "hand grenades" (i.e. explosives with metal fragments enough to damage) are heavy. Drones don't do "heavy" very well. You would need larger drones.
When we hear about "drone attacks" on things like the Saudi facilities, these are not the drones we're talking about.
Finally, this is not a "push button" attack. It's electronic based, sure, but the equipment has to be purchased, tested, staged, and eventually triggered.
Then, after all of that, it has to penetrate the target area. Again, I have completely confidence the Secret Service have gamed this out. It's readily defeated by holding events indoors. It can be readily detected by watchers at the edges of the event. One quick radio call can clear the stage. Chaos and and bedlam, to be sure, but likely little more than that. And that assumes they do not have some other potential countermeasure to deal with drone attacks (shotgun anyone?).
At this point, you don't even need an explosive -- simply have a drone make a high speed run for the podium.
Finally, there's no reason for The State to utilize these techniques. The State has boots on the ground. No reason to send in the drones when you can send in an entry team with a warrant.
Overseas, this is already happening, on a larger scale, with larger drones, Hellfire missiles, video surveillance, and chains of command. Don't need autonomous bots for that.
Firearms have democratized violence for centuries. We're still here, and thriving.
