Are you sure it has nothing to do with killing humans?
In fact, emotions have a lot to do with human survival. Mind controls the body. A person can virtually get frozen by fear, which is an emotion, someone who feels devastated and lonely is a much easier target in comparison with someone who keeps the faith and fights back. People reactions are the result of emotions, and body reacts in different ways when you are angry, sad, happy, scared, hopeful, etc. The level of love a mom has for her child is also good information. I am sure a mother would react different if a killer wants to hurt her child or someone else's child. I definitely believe that a Terminator who knew about emotions would be a better killer than one that doesn't.
For the ones who take Terminator 3 canon this is somehow revisited in that movie when they are in the cemetery and the terminator makes John angry to get him on again. The terminator also talks about fear when they are in the motorhome. As much as I hate T3 I must admit those bits were nice.
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