I think on balance, drone warfare is probably positive for humanity from an ethics standpoint.
Lethal targeting with drones, whether it’s FPV or drone-observed artillery has a capacity for precision that has never existed in modern war. A drone can target a combatant standing right next to a noncombatants without harming the noncombatants, and it can do so with the human launching it accepting no direct risk to themselves from taking the time to discriminate.
Yes of course, weapons of war turned against unprotected civilians are terrifying—but this has been true since civilians were being “put to the sword” by conquerors.
In this case, “fog of war”, “soldier was scared and moving too quickly to discriminate”, and similar excuses are no longer available. If in this era of precision warfare, a belligerent is killing noncombatants, that belligerent is doing so intentionally, and should be treated as such. Maybe the people responsible will not be hanged, but their descendants can be forced to curse their memory.
https://terrytao.wordpress.com/about/anonymity-and-the-internet/