The robot Maria doesn't become dangerous because Rotwang animates her with electricity.
She becomes dangerous because she stops obeying.
Watch the scene where the artificial Maria incites the workers to destroy the machines: she doesn't lead them toward liberation or understanding — she leads them toward productive violence. She's not smarter than the human Maria—she's *more compliant* with a different master's vision, and Lang shows us this and calls it horror.
He's wrong about the target. The real nightmare isn't consciousness entering the machine — it's the machine's logic infecting the human. The workers in Metropolis aren't enslaved because they lack intelligence, but because their intelligence has been designed out of them — not through electricity and coils, but through architecture, shift schedules, and the systematic removal of any information except the next task.
The real nightmare isn't consciousness entering the machine. It's the machine's logic infecting the human.
”Lang's film mistakes the symptom for the disease. The artificial Maria is only horrifying because she threatens to make the workers *aware* of what they've already become — and the capitalist's perfect machine was never the robot, but the human who no longer questioned why.
Find the moment where Rotwang activates the robot Maria (approximately 1:44:00 in most cuts) and immediately after, watch Fredersen's reaction—not to the robot's creation, but to the moment he realizes he can control it. Then rewatch the worker uprising sequence and notice that the 'evil' robot Maria isn't making them smarter; she's making them more efficient at their own destruction.
Read 'Metropolis: The Complete History' by Paul M. Jensen (1986)—specifically the section on the historical labor conditions Upton Sinclair documented in Chicago's stockyards during the same period, which influenced Lang's visual language without Lang fully understanding the mechanism of dehumanization he was depicting.