The "off switch" is a very persistent trope. The Lost in Space robot's powerpack was my favorite. And how about the Star Trek command code for an entire ship? It does seem we'll always want overrides, even on manned operations. Think about today's nuclear missiles. Would you feel comfortable if there was no possible abort code? Not me.
And when will programmers stop adding "back doors" to software? Never. They are too valuable for troubleshooting.
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