+1 above.

Anyone who has done computer-based training in the innocuous environment of one's own airline training center has had the system crash, while doing 1-g, and zero knots.

Everyone has had an FMC freeze-up at least once, some have had a failure.

Electronic Identification (EID) relies on radio signals of one kind or another, whether that be radar or interrogation of secure and non-secure squawks.

And radio signals (with the exception of HF, and we know how difficult it it is to use THAT) like line-of-sight. Even with LOS, no guarantees. Ever been in your home town, a regular location near a cell tower, and can't get your cell phone to pick up a signal?

Point being, the autonymous killers of Terminator will work just fine....in a world without mechanical or electrical failure or disruptions, or the limitations of physical law.

And that is about as likely as an honest and principled politician or car-salesman.