Negative polarity.

[OpalE]

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If you think that  STS harvestable means that your personality is charming, nice, or kindly at all, you have not enjoyed the history enough of the two other examples of such in the material, namely Tarus Bulba and Genghis Khan.

I don't think it's a universal trait -- others can definitely be bullied and threatened into hopelessness and submission (I've had it phrased: "Why fight it if you can't do anything about it?") -- but i've witnessed negatives start one-on-one relationships with a kindly front (gifts, agreeing with the other, giving buttloads of attention seemingly based in genuine interest in the person and their ideas) to put them in a prone state before "flipping the table."

In non-violent settings, it's an extremely common tactic.