technology has been, and has been seen, as being larger than we are, as individuals. It is no longer controllable by a single individual. We have built something larger than ourselves, at least concerning contained power (versus large buildings, etc.). Terminator is another iteration in this philosophy. Note in the film, the number of times humans are slaved to technology, or something as simple as the Walkman utterly removing a human from perceiving survival-level signals from its environment. And how even technology smashes itself.

Scary movies have always been about our most recent gestalt-level fear. This time, it's "Machines: Servants or Master?".

The musical group Kraftwerk ("Power Plant/Station") have long expounded upon these ideas. At what point does technology cease serving and begin demanding? Hint: It already has. Especially if you are on a computer, reading this.

(Cue Terminator =synthesizer= soundtrack...tum tum ta, ta tum...)

Good luck.