EXTREMELY good question. Partly (presumably) it's taught in University, as part of a Politics Course. But mostly, IMO, it's a trait learned in CHILDHOOD, in an UNJUST, ARBITRARY, RULE-CHANGING, GOALPOST-MOVING, FALSELY-BLAMING, WORD-TWISTING household. A household where the kid never won a conflict--ever. There was always a TRUMPED UP REASON, or EXCUSE, or INVENTED EXEMPTION, so dad (or mum) ALWAYS WON. That, I believe, is how you create a politician.
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