You're taking a large amount of responsibility an individual has for firing his weapon in combat away from him by that statement. If I choose to shoot something, it's based on a set of rules determined by higher ups. This can be as limited or as broad as higher ups have determined for the conflict but the actual decision to fire is mine and mine alone. In this instance, I am making the decision that regardless of any other considerations that said target must be dropped.
In the case of someone operating a drone, they don't make that decision. There are also specific rules and conditions for them, but ultimately they are the gun and not the individual.
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