Total control would be a bad idea, as we all know from a certain movie franchise capitalising on a similar theme.
At issue is the ability not only for ai to be spoofed by an adversary into attacking another adversary, it can create its own artifacts in processing legitimate information its sensors input and view this as an attack, the ghost in the machine if you will. Also, someone left test code in the actual system SAC used to detect missile attack and the testware ran when it was supposed to have been removed, indicating a relatively huge attack coming from the Soviet Onion. After a few moments of panic, other indicators of Soviet Onion attack were cross verified, indicating no inbound nookular meesiles at that time. So they took DEFCON back down to condition beige/hubris instead of condition kyag (kiss your ass goodbye).