The 17-year old Indonesian girl made a persuasive case to her family: lured by what she had read online, she told her parents, sisters, aunts, uncles and cousins they should all move to Syria to join the Islamic State group. Each of her two dozen relatives found something in it for them. Free education and health care for the girls. Paying outstanding debts for her father and uncle, finding work for the youngest men. And the biggest bonus: a chance to live in what was depicted as an ideal…