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I am firm. You are obstinate. He is a pig-headed fool.
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You know what it's like to persuade a pigheaded child to do something they don't want to. If they hear the same suggestion from someone else, they'll go right off and do it.
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To operate based on conviction and belief requires an acceptance that your actions could get you fired. This is different from pig-headed bravado, and it is different from putting the company at risk.