Within the family and social system, when one goes through the experience of hurt, exploitation and injustice, in order to survive person begins to build defense mechanism. They take their negative experiences as their reality and on slightest hint of such reality coming in front of them, they turn defensive.
This happens to people, who for some reason, are not being able to experience that they are being loved, and having strong survival instinct, they turn aloof in non-trusting manner, working towards reclaiming their crushed identity.
So this is a very complex form of disorder where various aspects of emotions are at play. Complexity comes from the fact that patient feels he/she is absolutely right and requires no treatment. LOVE and hope heals however obsessiveness and compulsiveness needs to be broken with proper treatment process.
It is very common form of disorder in low intensity among all of us. The need to protect “hurt” by building a defense mechanism is common feature. It remains dormant in all of us most of the time unless something triggers the same hurt and that is where it can turn into OCPD disorder as a desperate attempt to set the things right.