Re: John Connor's existence POLL
The real question is, after failing to kill Sarah Connor in the first film, why didn't they send the T-1000 back in time a day before the T-800 arrived, and suprise her all over again? Better yet, go back and kill her parents.
This time loop may be a closed loop and Skynet is locked within its parameters. Just like old Spock can't get back to the old Star Trek time line, because, at least from his perspective, it's not there anymore. Similarly, Skynet may be unable to travel outside the paradox loop before it is resolved (by sending Kyle Reese back in time.
He was a dreamer, a thinker, a speculative philosopher... or, as his wife would have it, an idiot. ~ Douglas Adams