A smart person might be good at school and individual contribuitorship, and so believe that they should naturally be good at political games as well. But truly, politics takes a whole other set of smarts and the things that make you an excellent IC do not much overlap with things that make you good at the political game: charisma, selling, risk-taking, deep emotional intelligence, extroversion, strategic intuition, sociopathy, commanding presence.
Many smart engineers can't even see see that the game is being played or they realize it long after the match has been won. They are not the players, but the pieces on the board.