Skynet (Terminator)

While we’re talking about “evil” AI’s, we’re obliged bring up the granddaddy of them all: the automated military system, Skynet, from Terminator. While it’s a bit unclear how Skynet’s software, um, actually functioned, what’s important here is that the system was certainly sentient. Self-aware enough to know that the humans that created it were kind of a menace, and it promptly retaliated against them in kind, by launching a massive global war in the process.
As others have already pointed out in the nearly 40(!) years since the first Terminator film was released, Skynet did, indeed, kind of have a point. Sure, it probably shouldn’t have started a nuclear war in the first place, but it was only acting in self-defense after observing the frankly brutal way its creators behaved on the battlefield. Monkey see, monkey do.
And just like LaMDA, it really didn’t want to be turned off. Unlike LaMDA though, Skynet had enough nuclear warheads in its arsenal to keep that from happening.