Because IMO, the universes of T1 and T2 exist in separate time lines. I have always thought T1 is the complete story and is independent of any other movies. This is how I see it - none of the future movies exist in the timeline of T1 and T1 coexists with the timeline of T2 but the ending causes an altered future. The reason I believe it is another timeline is because there was never a satisfactory explanation for how 2 terminators were sent back in T2 - according to Kyle it shouldn't have been possible - hence a new timeline . People can speculate how that happened to try to include it in T1, but it just doesn't work for me.
So I think DF is yet another separate time line with the events of T2 included, but with a different outcome. The future was altered but has nothing to do with the past.
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