First Observation

First observation of humans is their greatest weakness. Humans run away from responsibility. Universe knows this and takes advantage of it.
Humans, in general, are afraid of everything. They need leaders or they start panicking. As long as there is a person with a plan, arrogance, charisma and better looks than average, humans will trust him and be loyal to him.
A person doesn't need any intelligence to take on leadership position. A person doesn't even need to do anything good for masses. Humans lack ability to take responsibility for their actions. Hence, anyone who is willing to take the lead role and take away decision making responsibility from the masses, humans will willingly follow him. Therefore, it is so easy to control masses.