NOT the parents fault
I got a kindle fire as a gift, and I am a bit scared of it. Once you enter your Amazon ID (and you need to do that to set it up) it knows everything, including your credit details. Even if you never entered it on the device. I can see how parents set the device up, install a few 'free' games, and hand it off to the kids to play, all the while assuming that since they never entered any credit details or authorized any purchases this would be a safe thing. Of course the parents could figure all this out, I did. But the point is that Amazon made it too easy for kids to spend their parents money if they have access to a kindle and gave too little warning to the parents. Apple did the same thing, and they paid for it (and fixed it afterwards).