The most influential element for good teamwork is trust. When trust goes up, fear goes down; and vice versa. When people work and play nice together, it means that there is high trust in the group.
Antonio Damasio, (2003, Looking for Spinoza) the renowned neuroscientist, has demonstrated the important role of emotions in decision-making. When we insist on removing emotions from our decisions, we are ignoring the emotional part of our decision-making process. Why do we choose to avoid emotion, especially in a business or professional setting?