those who leave the congregations and organisations ALWAYS end up bringing unhappiness to their lives
In a way that's true. I'm unhappy that the part of my family that remains JWs won't talk to me because I no longer attend meetings. (FYI: I am technically a JW in good standing).
Whenever I meet up with a JW that still attends and they ask me how I am I always say, "My life is fantastic! The ONLY part of it that isn't good is the lack of relationship with my children." [The ones that are still Kool-Aid Drinking JWs].
It's always very telling to see the look on their faces as my statement doesn't compute because of their beliefs.
Sometimes I ask if they'd like to help with a reconciliation. They always say, "No." Always.