A: The computers are highly reliable, with self-healing system architecture that makes humans powerless to stop annihilation.
The all-powerful computer system threatening the extinction of the species is an enduring Hollywood myth, and thus a part of our popular culture. Consider how humans avoid the apocalypse in the earlier Terminator films, almost any Star Trek episode, WarGames, Superman III, Independence Day, and Short Circuit by disrupting the heating and cooling systems, power supply, or software of a computer system.