Tailkinker

Chosen answer: The whole thing's a paradox, which, as time travel doesn't exist, we have no way to determine how it would work out in reality, and thus any movie dealing with time travel can make up its own rules. Effectively an infinite loop has been set up - Sarah gives birth to John, John grows up, meets Kyle, sends Kyle back to meet Sarah, they make love, Sarah gives birth to John and so on and so on. There may have been an original father to John at the beginning, but he was supplanted in the loop by Kyle and thus, in the timeline the film presents, the John who sent Kyle back is the one fathered by Kyle himself. Alternatively, maybe John Connor wasn't the original resistance leader, that some other leader sent Kyle back the first time, leading to the birth of John Connor, who then became the resistance leader instead; thus Kyle has always been John's father. This is the nature of a paradox, that there are things about the situation that don't necessarily seem to fit together, but they somehow come about anyway. The detail can be debated ad infinitum, but no concrete conclusion can be drawn, because that's just how this works.

Tailkinker ★

Chosen answer: Kyle was. It's a paradox, an infinite loop; Kyle goes back, fathers a son who later meets the younger Kyle and sends him back to father a son who later meets the younger Kyle... etc. etc. There are no hard and fast rules governing this sort of thing, so there doesn't necessarily have to have been an original father who kicked the whole thing off before being supplanted by Kyle. Or maybe there was. Or maybe there was originally a different resistance leader who sent Kyle back, leading to the birth of John who became resistance leader instead. This sort of thing can be debated until the cows come home, but ultimately the only answer is "it's a paradox".

Tailkinker ★

Chosen answer: Because the gathering of new information is still a key part to what they do. There has to be a write setting, even a restricted one, in order for the Terminators to assimilate new information that can assist them in their missions - possible target locations, voiceprints, even new mission parameters could not be uploaded without the ability to write to their CPU. Skynet can (and does) set restrictions on the Terminators' learning abilities, but, without those abilities, their effectiveness would be compromised.

Tailkinker ★

Chosen answer: He'd just mugged somebody in the alley for their trousers.

Tailkinker ★

Chosen answer: It was a defensive move, basically. As Skynet developed and increased in complexity, it ultimately achieved sentience and became self-aware. The humans tried to pull the plug, effectively trying to kill the new intelligence and Skynet fought back, utilising the nuclear arsenal to attempt to eradicate those who would shut it down.

Tailkinker ★

Answer: It's all in the film - Reese tails Sarah from the moment that she leaves her apartment. He's waiting outside the bar that she's in when she sees the news report and follows her down the road when she leaves - she sees him and gets scared, which is when she ducks into Tech-Noir. He sees her go in, then walks past, before turning back and entering himself.

Tailkinker ★