Drone warfare is an evolving technology.
It began under GW, increased under Obama, and has increased even more under Trump.
The principal of killing at a distance began with a rock in a sling.
Bow, catapult, gun, bomb, missile,... and now drones...
Killing at a distance is morally insulating, but Presidents are always insulated.
What it has to do with the Hatch act I have no idea.