You can setup a machine gun on a Remote Weapon Station and control it via the internet. You could have agents as machine gunners. Same with rocket launchers.

We are literally seeing the large scale use of robotic weapons platforms AT SCALE.

Machine guns create a storm of ballistic objects, and have been doing so for over 100 years. Large scale murder isn't new. We just have systems that have cameras that make it easy to put the footage online now.