Know what you're talking about is good advice

President Donald Trump has strong opinions, strong confidence in his decisions and often uses strong language.

All of which can be good traits for a leader. Assertiveness and assurances, particularly in times of crisis or disaster, can help the public feel that someone is taking charge and will make things better. Nations need leaders who can bring people together in times of sadness.

Such as the day after a deadly crash between a passenger jet and a military helicopter at Washington National Airport last week. Trump started his press conference by calling for a moment of silence and prayer fo...