The stressed private might still have a bit of empathy and humanity. Meanwhile millions of drones can be programmed (or hacked) to kill millions of people without excluding civilians or anyone
That's the same with these drones. The smarter they get, the further away the human goes. Today it might be simple to create autonomous weapons who are instructed to kill vehicles matching various known appearances. That too already exists. The strike on the Russian bombers was reportedly carried out manually, but it would have been pretty easy to have that autonomous, since the targets are huge, stationary, easily recognizable and easy to navigate to in the geography.
If you launch a quadcopter and instruct it to kill any adult human it finds, then that's the same thing. You wouldn't launch it into an area where there is a remote possibility of being any civilians. No difference from firing an artillery shell. If there is a civilian, or a soldier waving a white flag or whatever - there is no cancel button for your artillery shell. The decision to kill whatever is in the other end was made when you fired it. There is literally no difference between firing a million drones and firing a million artillery shells down range. It's your human responsibility and your human consciousness when you make the decision.
I don't think we have had widespread use of autonomous human-targeting drones yet, but it's by no means science fiction today. Just a matter of time. We'll see their use in this conflict.
All the bombs Russia thrown onto Ukrainian civilians were thrown by human soldiers.
Yet. Drones also don't get tired.