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I was about to say exactly the same thing. Pain is a signal that something wrong is happening.

When the rest of the robots don't understand. Could an effectionate robot use drugs to cope with their sensors or would we become prone to enslaving robots?!

right, seems like it would just make them all the more efficient at what they do

yup...most automation is like that. I'd be stupid not to.
It's called "safety shut off".