The default to emotion is part of the human condition.

To better appreciate the role of emotion and what it allows an audience to do, we need to take a brief detour into evolutionary biology. The human brain can be understood as three separate brains working in tandem, if not completely integrated with each other. The primitive brain and the limbic brain collectively make up the limbic system, which governs emotion. Within the limbic system, there is a structure called the amygdala, which leaders need to understand.
 

By Helio Fred Garcia as seen in Fast Company