Killer robots with no pain or fear of death would be much easier to fight off than ones who have pain and fear of death. It doesn't mean they won't get distracted and lose focus on fighting when they're injured or in danger. It means that they won't avoid getting injured or killed. It's a lot easier to kill someone if they don't mind it if you succeed.
True! I was actually trying to be funny in (4), tho apparently I need more work.
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