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Isn't it about stability and the perception that the political establishment is always about to be discredited?
So, we don't let the people know too much about what happend behind the scenes when JFK was assassinated, because that would undermine the legitimacy of our government. Same with Watergate. Same with all the scandals. Same with 9-11. There a big one.
Obama chooses a war cabinet and no one from the left in foreign policy or economics. That sends a message that there will be no tinkering with capitalism. Obama has to send a lot of messages that the way things have been done will not change much.
The nepotism is all about the reassurance that nuts don't fall too far from the tree.