The "truth" shall set you free, or does it?

I just read these words of wisdom from a book.  For best results, please read slowly...  

"...That something feels natural or unnatural doesn't mean it is...we mustn't forget that the familiar fingers of culture reach deep into our minds.  We can't feel them adjusting our dials and flicking our switches, but every culture leads its members to believe some things are naturally right and others naturally wrong. These beliefs may feel right, but it's a feeling we trust at our own peril.  

...each of us is constrained by our own sense of what is normal and natural.  We're all members of one tribe or another - bonded by culture, family, religion, class, education, employment, team affiliation, or any number of other criteria.  An essential first step in discerning the cultural from the human is what mythologist Joseph Campbell called detribalization.  We have to recognize the various tribes we belong to and begin extricating ourselves from the unexamined assumptions each of them mistakes for the truth."  

Read the last sentence again, carefully. "We have to...begin extricating ourselves from the unexamined assumptions each of them mistakes for the truth." 

I don't believe this "detribalization exercise" suggests one should denounce any culture or tribal customs mindlessly; to be human is to be gregarious.   On the contrary, it advocates mindful association through relentless and purposeful questioning and self-reflection.  Questioning and self-reflecting tribal-assumptions we have been treating as "the truth."  

My experience suggests serious, meaningful self-reflection is incredibly difficult, maybe even painful.  It requires that I take introspective look at the deepest core, to examine my paradigm, to face all my insecurities, and deal with them.  Only then can the lifelong practice begin.  Since we are to constantly challenge our paradigm, there is no end in sight.  You constantly challenge paradigms and you constantly detribalize, mindfully.  The self-reflection and detribalization becomes a part of who we are.  

I believe self-reflection and detribalization is not for the faint of heart.  True, it is much easier to go with the flow of the tribe, believe the unexamined tribal-assumptions, and adhere as if they were the truth.  But, why live is an unexamined life worth living? 

Our journeys are as individual as each of us.  My tribe may be one of the same as yours but more likely than not, different.  I wonder what kind of unexamined assumptions I have mistaken as the truth about my tribe all along?   And about yours?