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Originally Posted by Twistys Tim
If you look at things from SkyNet's perspective -- you would see that according to all calculations traveling through time to kill Sarah Connor was a fruitless endeavor, as John's existence in Skynet's present (in 2029) was proof that Skynet was unable to affect the present by altering the past.
If indeed Skynet could have effected change, then the present it was operating in would not have contained John Connor. 45 years earlier the machine it sent back to kill his mother was unsuccessful, as John's presence in 2029 attest to. Upon inventing the the time machine -- and being defeated, Skynet would have calculated that whatever actions it may undertake in the present / past will not result in it being successful.
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well yes and no, remember you don't know if you live in a 4d or a 10d world.
if you knew you were in a 4d world then yes the you are correct but skynet would not know yet.
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Now we can look at Reese and John. In John's present prior to Reese being sent back to 1984, we can say that Reese has already traveled back in time, as without that event having already occurred John could not exist. But, John could have said to Reese "there is no point in traveling back in time to stop the machine -- as I am alive in the present, and therefore the machine will fail in it's attempts to kill my mother." If this were the case, and logically this is correct (John does indeed exist in 2029) and Reese did not travel back in time how would John's existence be explained?
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but that the point john conner does know that the universe is a 4d world (his mother wrote him a letter explaining to him at the end of the movie), he knows that if he does not send his father into the past the consequence would be a complete destruction of everything (think universe recreating itself at that second over and over again--> an infinite number of big bangs happening at that second).
so he has to send his father back in time.
if he didn't send kyle into the past everything would cease to exist, so the situation you are talking about would never happen, that the consequence of not following thru with a PP.