The ultimate irony in this vast struggle (available to audience members who want to think about it but easily ignored by those who accept the semi-happy ending ) is the irony in many time loop (or ontological paradox) stories: John Connor has created himself (though he has not gone as far as the character in Robert Heinlein’s “All You Zombies” who is both his own father and mother). Far worse, by saving his mother’s life and ensuring the destruction of the Terminator, John Connor has created Skynet just as surely as Skynet has created John Connor by trying to kill him. Both Connor and Skynet exist in a time loop without outside causality. The Terminator’s surviving arm makes Skynet possible, but it is never invented, only found and back-engineered. Kyle Reese comes across time for Sarah Connor because of a picture and because John Connor asks him to, but neither the picture nor John Connor would exist if Reese had not already gone back in time. The simplest way to save the world is to let the Terminator kill Sarah Connor. Then (in all probability), no one would find a piece of the advanced technology, and Skynet could not be built. But, Cameron’s plot suggests, the “perils to come that would result from our hubris and blind faith in technology” may be inescapable, a time loop, a feedback loop, leading directly if not necessarily inevitably to destruction."Fighting the History Wars on the Big Screen: From the Terminator to Avatar" from The Films of James Cameron