Because too many people are operating from false selves - that are merely automatic processes built by our interactions. Only the true self is free.
The true self is free, and nothing else is free. It is unique, thus all free thought is unique - it is also a child of divinity so the true self is godlike and in relationship with deity and all other true selves among our siblings (men and women, also angels and demons).
If we are not thinking from our true selves, we are just responding robots - we are automatic and we are existentially isolated.
There is a chosen state of unfreedom that is the entombing of the true self within automatic responses, stimulations. Such a person is a true slave - such a person has enslaved himself to the environment. (True slavery is a mental choice - a physical slave may have complete freedom in thinking from his true self.)
Another state is to choose freedom but deny relation - to cut-off the divine relation with deity. This is a complete freedom without meaning - it is total isolation.
To accept unfreedom is either mental slavery or isolation.
(We are born free, but from our freedom choose unfreedom - this is usual, it happens sometime in childhood, adolescence, or as young adults. There is temptation, and mostly people choose to succumb. And they know it. They could escape - but pretend they cannot, that there is no escape -- or that there is nowhere to escape to...)
It is our task to live in freedom and in relation, live in thinking located in the true self. The enemies are confusion, hedonism, cowardice, dishonesty... pride. Freedom is a state of simplicity and clarity - unique and potentially universal. And there are no shortcuts to it, no standard methods, no single or safe path.
We must reach our unique freedom from our unique circumstances - this is a quest, an adventure, it is happening now.
Only from a condition of freedom can we be Christian.