I find that the biggest reasons for strife are communications and stubbornness, but I think there's a better word for it. Maybe we can't express how we actually feel in those circumstances, and we wouldn't settle for less than what we desire. I don't pretend to be an expert, but in the cases where people have failed to do a thing, a common cause is their lack of communication. People can certainly communicate, but it's delivering the message the way you intend to the audience that has the greatest impact that matters.