One reason is that they do not believe in who they are or why they are here. In fact they believe in nothing at all. This is a result of a confusion of so many different theories on how we came to exist and how we should live our lives. Theories given to us by generations before who have based their decisions on fear. Fear of death and fear of a world out of control.
So how do we truly get to understand the truth about our existence? One way is to connect to ourselves which then in turn allows us to connect to the Universe around us. Connecting to the inner you will not only allow you to live a happier life, but will also give you a true reason as to why we all need change and become more aware of the place that provis