What is the root of all the problems in the world?
unrealistic expectations,lack of compassion/apathy.
God and intolerence. The belief that I am right and every one else is wrong.
The human condition. Our thought processes are far less aware / conscious and far sloppier than most people realize, and our emotions rule us. Even the minority of folks who understand logic, logical fallacies, and critical thinking, under-utilize it (and no, I'm not satisfied with my utilization, either).
Whatever hope I have for humanity is based on the slowly (hopefully, not TOO slowly)-improving respect for rational thought and discourse and the erosion of negative systemic influences like religion.
The root of all problems... Reality. Important to remember when they think you take too much for granted. No reality, no problems. More reality, more problems. Increase the number of variables and the possibility of complications leading to failure increase. Most success stories are tales of reducing expectations, compartmentalizing, and managed time and resources. Not gifts from above, and not extreme suffering.