In Terminator Salvation, Conner makes a big deal about saving his father, Kyle Reese, stating that he is the key to the future and the past. But Kyle Reese should not be of this much importance to Salvation Conner because it is not as though Conner will cease to exist as he already sent Reese back in a previous timeline thus creating the Salvation timeline and Salvation Connor.
The only thing he would affect would be another parallel timeline that has yet to be determined in which Reese would not be alive to be sent back, and Conner wouldn't exist, meaning Skynet would win. But I mean, why would Salvation Conner care? I don't often concern myself with what could happen in a parallel universe where my father didn't meet my mom which somehow resulted in worldwide annihlation.
I suppose the same question could be posed regarding the Connor who sent back the Terminator to protect himself in T2 - why care about the events of another timeline?
Is this an oversight or just a plot point without much thought?