They don't see it like that. They think it's the people who realise it's a cult and leave who split up the family. As my family kept telling me I caused this 'difficult situation.' Also when people join the cult and their family are puzzled by this weird religion, it's their fault for not giving up Christmas and birthdays.
You occasionally meet people who have this personality type where they never accept responsibility for their actions, it's always someone else's fault. With JWs we have an entire region that does that, they are never weird, they haven't split up the family it's everyone else in the world that's at fault for not giving up their whole life to fit in with them.