I knew a man who wouldn't talk to his own son. I am neither the man nor the son. The son is a very disillusioned friend.
I have to be careful with how this is said in order not to blame any innocent group by mistake.
The man was a religious man and went to his local religious place of worship and all associated get togethers. His son didn't want to go to this place of worship, it seemed like mind control to him. So he went to the pub, smoked pot, and got involved in very petty crime so his Dad disowned him.
Then the man who wouldn't talk to his son was arrested and jailed for sexual abuse of children within his religious group. He had been doing it for 40 years and it was his job to investigate such things.
How does any group deal with that? When it has taken it's eye off of the ball and innocents have been traumatised.
But far, far more importantly, how does the innocent son carry the weight of his father's crimes? How could he ever go back to the group?