I would like to use the expression "raison d'etre" in my writing. What I would like to express is a lack of thinking or mental activity when someone doesn't question a process — they just follow it. They do not look for the essence of the activity (why was it created? how can it help? etc). This attitude can be positive or negative; in my case it is positive.
What I wrote is
They do not question the raison d'etre of the process, they just follow it.
I don't know whether this is correct, and whether it means what I want to say.