If you want to control someone, all you have to do is to make them feel afraid.
Whether a categorical phobia or not, fear is a contagion and, thus, an effective tool for controlling.... In his book, Fate is the Hunter, Ernest K. Gann elaborates:
Fear is a contagious disease, spreading from its first victim to others in the vicinity until it is powerful enough to take charge of a group, in which event it becomes panic. Fear is the afterbirth of reason and calculation. It takes time to recuperate from fear.But it is more….Fear makes money—it sells—as Daniel Gardner writes in The Science of Fear: "The countless companies and consultants in the business of protecting the fearful from whatever they may fear know it only too well. The more fear, the better the sales."
Security is really the aim, the desire, and is why fear works. Who wants to be insecure, at risks or in danger? Jiddu Krishnamurti, On Fear, writes:
Fear begins and ends with the desire to be secure…the desire to be certain, to have permanency.  To find security and be secure is the everlasting cry. It is this insistent demand that breeds fear.