Science fiction features evil robots, death rays, and genetically created monsters. Entertainment is one way we psychically reckon with our relationship to technology.
Our technology goes crazy sometimes due to a flaw with the technology, malicious purpose, or user error. Technology isn't evil, but it can act that way.
Killer robots populate dystopian science fiction, from "Terminator" to "The Matrix." We imagine futuristic mechanised assassins, not 1970s manufacturing employees. Reality is weirder than fiction.