In the sense that Kay meant it,Michael was full of B.S. Senators and presidents don't have men killed like the Corleones or the Mob in general. All of the examples you gave are dead on the money,but it's apples and oranges. No Presidential candidate is going to kill his rivals to get elected,no President is going to whack a Cabinet Member who shows disloyalty. If that were the case Michael would have a legit point.