I think your interpretaion of both movies is too literal. Yes, to a certain extent, they're both about technology run amok. But at their heart, it seems to me that they're both really about the duality of man, and the horrors (both real and potential) of the 20th century.
One of the central features of every horror movie is the return of the repressed. In the case of the Terminator movies, what has been repressed is the memory of totalitarianism and genocide, and the fear of nuclear war. The memory of the ways in which human beings, and specifically men, have used technology to enslave and murder their fellow human beings, and to ruin and destroy an entire century of progress. The memory of the ways in which men willingly became heartless, unfeeling, inhuman instruments of tyranny, death, and destruction. And the knowledge that, somewhere behind the scenes, under the surface, and beneath the skin of contemporary society, the potential for even greater mass murder and mass destruction still exists, in the form of nuclear weapons.
In both movies, this repressed memory and repressed fear returns in the form of the Terminators. On the outside, the Terminator in the first movie resembles the Heroic-Realist statues of Nazi Germany, with its bulging muscles and Teutonic sneer. But on the inside, it's a soulless, heartless machine with no personality or conscience--a robotic genocidaire.
The T-1000, by contrast, is not even superficially human: it is metal, through and through. It's as physically unthreatening as a USAF airman working in a nuclear-missile silo, launch key at the ready. Its ability to change form at will suggests, at least to me, that the totalitarian, genocidal impulse that was formerly concentrated in places like the Nazi death camps has metastasized throughout our society. When given the chance, it reverts to type, wearing a cop uniform and motorcycle boots which recall the Nazi SS.
These machines are not Others at all. They are Us. Both of them represent certain ideals of masculinity which men willingly embraced in the previous century, and their violence is no more brutal or indiscriminate than that which these men have inflicted on their fellow human beings. On Judgment Day, Skynet even uses our own weapons to destroy us.
But, thankfully, not all men have embraced this ideal. If the Terminators represent men's evil and destructive impulses, then Kyle Reese represents their good and creative impulses. Reese sacrifices his own life to save Sarah, and warn her about the future. And in the process, he joins with her to bring new life and hope into the world. Doomsday is still coming, but humanity will survive, and life will go on.
The situation in T2 is more complex: in place of the first movie's black-and-white morality, we have shades of grey.
In this sense, both movies are products of their time. The Terminator was released in 1984, when the nuclear arms race was at its height. T2, by contrast, was released in 1991, after communism had fallen, and the threat of nuclear annihilation had receded.
On the one hand, we see that Sarah has drawn the wrong conclusions from her experiences in the first movie: that the only way to fight the machines is to become as hard, and ruthless, and unfeeling as the machines. She has become corrupted by the same robotism that almost destroyed her. And when she learns Dyson's identity, she becomes a Terminator herself, buckling on a hyper-masculine shell of combat gear as a symbol of her resolve. But in the end, Sarah's humanity reasserts itself: unlike the psychopathic Terminators, she cannot bring herself to shoot a defenceless human being in cold blood. The end does not justify the means.
While Sarah is trying, unsuccessfully, to dehumanize herself, the 'good' Terminator is gradually being humanized by his relationship with John. This character, to me, represents the War Machine which was built up to fight first the Second World War, then the Cold War--a machine which, in the post-Cold War environment of T2, has now outlived its usefulness. Once it has successfully defended John and Sarah against the T-1000, it realizes that its continued existence would only endanger the world. It too must be destroyed--melted down, like an old sword, to be re-forged into a plowshare.