"Reality tunnel," -- I just was introduced to that word as a modern psychological insight.  It is I think similar to a Buddhist concept dating from way back as to why it is so hard to change people's religion and conscience and even things like thinking the earth is flat and up and down are absolutes.  We are wired to "believe" things we pick up as a child.

I think though that there are complications.  Hard core "beliefs" can be modified with meditation into less rigid opinions, which then become subject to analysis.  (Meditation can also, unfortunately, be used to harden opinions into beliefs).  Also there is a teen period of rebelliousness (so that the individual can establish an independent identity), when much of this can come into question, leading to no end of angst and turmoil, until in most cases the individual returns to the fold, with much joy and peace (all hormones in there doing what they are programmed to do).

The thing about such beliefs is that most people don't even notice they have them.  They sit on them as though they were furniture -- something to be noticed only if attention is drawn to them by someone else, and then the reaction is typically not of the mind but of the instincts, with denial and anger and rationalization and so on.

There are some who break some of these beliefs.  Interestingly when the person does so sometimes the reaction is hate of the original belief and of the organization that imposed it.