When the first Terminator movie was released in 1984, its HKs seemed as futuristic as its time-traveling cyborg title-character. Nearly three decades later, we're living in an age in which armed robots do regularly surveil, track, and kill people.
The drones do not make America safer. They inevitably provoke blowback. They are not a way of waging war cheaply. They require massive investments in client states and "nation-building" on the ground. They kill people, but no victories are won from the air.