You should give more credit to the emotional part of your brain :) It's not that stupid. There's a little extra something in-between the pain and the person causing it, that triggers the reaction of hatred against the person -- probably the expectation of hostile intentions. It's likely not a simple two-item person+pain=hatred association arc; even our emotional selves know this.
Even a dog knows the difference between being kicked and being stumbled over.
-- Oliver W. Holmes
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