- An open mind. A leader who makes decisions and then never listens to any arguments about those decisions cannot really be a good leader. Such a leader will tend to just go with his/her instincts rather than listening to all sides and deciding which is best.
- Decisiveness. However, once a leader has listened to all sides, he or she will often need to make a strong decision quickly. A leader who is wishy-washy will not be good either.
- Finally, a leader needs to be calm. Leaders who respond out of passion rather than out of reason will make too many mistakes.
I think that they choose to calm down so that they will be able to think clearly on how to manage their current crisis.
Sources:
http://www.enotes.com/law/group/discuss/what-traits-good-leader-should-have-why-69299