If people do not challeng you anymore, you are fucked.
“none of that stopped him from making one of the dumbest decisions any leader has ever made, because he was arrogant, because he’d gotten away with so much for so long that he confused his luck for a system, and because (with the exception of Talleyrand) most of the people around him had simply stopped telling him no.”
https://www.joanwestenberg.com/sometimes-powerful-people-just-do-dumb-shit/