ISIS make the JW religion look positively benign.. even though they use the 'indoctrinate kids while they're young' in the same way. At least the JWs don't kill anyone (at least not physically).
It's really quite frightening what ISIS are doing! Can you imagine in 10 years time these fully indoctrinated children will be doing the same as their mentors. Ruthlessly killing anyone who doesn't go along with them. If you do go along with them you have to do the killing too. It'll be a never ending vicious cycle.