Re: Drones that make kill-no-kill decisions
Most of those weapons are used on battlefields, where there is mostly you and the enemy. A Phalanx point defense gun is unlikely to attack an innocent observer.
Mines are an exception, and are probably your best example. A lot of damage to innocent people has been done by leftover mines. But on the other hand, mines don't wander around looking for something to kill either.
Another SF example would be Keith Laumer's "Bolo" robotic tanks. The later versions of these were actually intelligent, and trained in military honor and moral decisionmaking.