If you want good decisions on important issues you need smart people to argue passionately about how other smart people are wrong. You just don't want those arguments in writing if something goes wrong later.
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Yep. Having a culture of on-record dissent tends to solve for deniability and CYA if things go to hell later and you have to defend your part of the action. A culture of off-the-record dissent produces good decisions but is less auditable

