Leadership must be likeable, affable, cordial, and above all emotional. The fashion of authoritarian leadership is gone. Football is about life. You can't be angry all day.
Presidents with strong nerves are decisive. They don't balk at unpopular decisions. They are willing to make people angry. Bush had strong nerves. Clinton, who passed up a chance to eliminate Osama bin Laden, did not. Obama is a people pleaser, a trait not normally associated with nerves of steel.
But to be fair, if you take players from my era to now, the game has changed and the players have many more shots. They use them differently than we did. The speed of the game has changed.