Interesting point. In the Convention video it showed Sergai defying the government by practicing his faith in a country where it was banned. He went to prison for it. The message in that situation is obey the GB in the face of the State no matter what happens.
But the all out resistance approach is not applied to stopping their children being forced to have blood. It may not be thoroughly effective to try to withdraw their child from hospital but they don't attempt it.
It is a double standard but its easy to see why it is the case. It would be so damaging to them to do this. It would not just look awful in terms of public perception, but it would stop them getting tax exemption - the government would clamp right down on them in a big way. Plus, I am not sure many JW parents in that situation would go along with it.
I recently read a book by Ian McEwan called The Children's Act which has an English judge dealing with a case of an underage boy who refuses a blood transfusion. The boy is nearly 18 and the judge has to make a determination as to whether to step in or not. She ends up forcing the child to have a transfusion and he survives but the boy comes to see his parent's true feelings about the blood policy. He saw that as much as his mother and father were outwardly trying to stop him having a transfusion, they were relieved when the issue was taken out of their hands and he was saved. It made him see through the religion.
I think that is probably quite an accurate representation of how things stand when push comes to shove for many JW parents. They don't want to fight too hard - as long as they make some effort its enough - they are more than likely relieved when the Court takes charge and they can maintain their clean conscience while their child can get to stay alive. And they are relieved that the Org doesn't talk about breaking the law to try to keep it from happening.