Well he kind of is already. First one caused it's eixtence via it's wreckage. Second one changed things mildly, delaying Skynet.
Either way, the actions of sending Terminators back in time ensures it's existence.
Also, in T3, shortly after taking the Car, the female Terminator makes a call, and hisses binary. Could this be a transmission of the final part of the programme of Skynets Awareness?
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