Growing up, there was much abuse in my family. My dad was an elder and for several years he was PO.
Following one incident of police involvement, I was talking to one of the officers. I was no longer living at home but was very involved with my younger siblings and one of them had called me to come help. So talking to the officer, it came up in conversation that my family was studying the bible just before the violence. He response: You'd be amazed at how often 'bible study' is the activity that families say they were doing just before the violence.
It's not just JWs. But their structured regimine does not give much room for release of steam. And the pressure to be 'better than the rest' takes it's toll. Often on the children.
-Aude.