Having humans inbetween the automated steps reduces potential errors introduced by bugs or compromised software. If the last step in Cryptolocker was "Now have

Having humans inbetween the automated steps reduces potential errors introduced by bugs or compromised software. If the last step in Cryptolocker was "Now have the user manually enter in terminal commands to encrypt each individual file", the virus wouldn't work at all. Requiring two human beings to agree with each other that an alert is legitimate and for them to both need to confirm coded messages, target the missiles and to simultaneously turn four keys at the same time - it's a pretty big meat-based firewall for malicious or buggy code. Not that what runs the silos is really that easy to mess with. They still do software updates with eight inch floppy disks.