Resentment seems to be a common source of extreme, sustained drive that makes people take on ambitious projects. What are some others?
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Sunk cost fallacy is definitely on the list, as is social or financial overcommitment, and obviously avoiding embarrassment as well.
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But I think the one that is ignored here is that some people see a way to change things, and purposefully commit themselves to doing it
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hmm never met one of those who didn't turn out to have something else going on under the hood
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I don't know any of these people well personally, but it seems like you are over-isolating resentment as a cause, ignore bigger picture

