The Terminator came out in 1984 during the Cold War. Nuclear weapons, climate change, etc. were all possible way humans would cause their own extinction. Nothing has changed in the last 40 years beyond computers. AI is essentially no closer now, than it was back then to creating a sentient entity. Dr Strangelove had an automatic launch sequence for the Russians; it does not need to be sentient to cause our destruction. Maybe trying to write seventh movie in a series is a sign you should move onto something new. I agree the dropping nuclear bombs was horrendous. I would argue carpet bombing Japanese cities before hand was horrendous. The bombing of Dresden targeted the entire city including civilians. The bombings of London, the attack on Pearl Harbor, Singapore, etc were horrible. How about the American genocide of First Nations in the preceding few hundred years.
How about the sexual slavery, human experimentation, using chemical weapons on civilians by the Japanese amongst many other war crimes. All horrible but why is one more horrible than the other.