There are other explanations that would cover both his initial Anonymous activities and his rapid cooperation with the police, like enjoying the attention and power that comes with getting one over on other people.
In the same way that trolling forums posting racist, awful things is easy from behind a computer screen the same is true for "cybercrime". I once committed a pretty serious felony and it was easy to do because it wasn't a violent crime and it didn't feel like theft. It felt like a victimless crime. Crimes that seem victimless are really easy to commit. Anyone who meets me cannot believe I'm anything but an upstanding respectable citizen but I also didn't think of consequences before I did what I did. So I can understand how he could not think of his kids before he started hacking. When I got caught I took a deal too. It's something you just can't understand until you've been there.
Sorry to rant. This wasn't directed towards you specifically. It's just that what you said reminded me of some people I know who like to "protest" but are all talk and full of BS.