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One of the biggest problems with the Terminator narrative, is that all evidence of the machines were destroyed and the man (Dyson) who would would invent SkyNet in the future died before he could invent it. So in the universe that Sarah / John Connor existed in in T2, the SkyNet would not exist, thus negating the need for John had to send back Reiss (his father) to save Sarah from a machine that could not exist.
However -- if the machines did not exist there would be no need (or capability) for Reiss to travel back in time, and John would not exist.
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