Many powerful people think they have a good balance between an inner circle that provides access, information and intellectual support, and a bouncer circle that blocks threats, people and noise.
Many actually only have a pure bouncer circle and don't realize it.
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Anybody who lowers the probability of something getting through, whether or not they have obvious admin or attack dog type personas
Bad attitude for your boss to have. They will "end up poisoned by the stink of their own reflections." - Herbert.
And then they'll blame you for it. :D

