The reason that JW kids get thrown under the bus is because of the near fever pitch hysteria that WT puts its members through regarding Armageddon. Since I was a little kid, my parents believed that Armageddon and mass killing and destruction could break out at any moment. As a result of this fear, all kinds of insane parenting seems ok if it will help save someone from being destroyed at Armageddon. This is the real reason for JW mental and emotional abuse of children: Hysterical Fear
True story: I knew a JW family that their eldest daughter turned 14 in 1977. Like a lot of kids then, she started to act out because of a combination of the spectre of Armageddon and the failed 1975 prophecy. She became sexually active with someone in her neighborhood. He was 26 years old. Instead of calling the police (agents of Satan) like a normal parent would do, her parents encouraged them to marry. I am convinced that the reason was so that she would not be destroyed at Armageddon for slipping around fornicating. I can almost bet the local elders were in on this as well, but can't confirm. The girl was unbaptized.
She was so young that they had to give parental permission for her to marry. Later it was found out that the man she married was an ex-convict and had been previously married. He had done time in a different state for shooting his wife in the face with a shotgun. Not sure if she died or not.
So instead of going back to prison for statutory rape where he belonged, he got to marry his victim and make her life a living hell for the next two years until she finally left him and had to move back home.
Of course everyone blamed the girl for being stupid, sinful, and prideful for not leaning on Jehovah. She is still alive I'm told, but her alcoholism is so advanced she cannot put two coherent sentences together from what I understand from a family member.