What is difficult about Teamwork?

LinkedIn Discussion: Linked 2 Leadership: "What is difficult about Teamwork?"

Too much hope and not enough smart trust; people that aren't willing, or unable to have good conflict; leadership is unable to get real commitment; team members aren't willing to hold others accountable, nor be held accountable; desired results aren't continuously being cast and re-cast.

But, if I had to put it in 10 words or less, 'uncommon agendas that lead to bad behavior and poor results.'"