Maybe he didn't care about getting caught. Like sometimes its cool to be caught if you catch my drift. But actually i think your link, links to someone who acted even more stupid.
Your link, linked to this
http://news.cnet.com/8301-13506_3-57391349-17/lulzsec-arrests-deal-blow-to-hacker-group/
And this story is also in a newspaper that i bought. Its about Hector Xavier Monsegur --> HXM who got caught by the FBI for hacking, and instead of taking the full punishment he joins forces with the FBI and reveals other hackers so they can get caught too.
Like putting yourself to jail is as stupid as it gets but to put other people in jails is much more stupid.
HXM wanted a revolution, and he continued behaving like a revolutionary even under the control of the FBI. On the day before he had to go to the court he tweeted "the feds are right now investigating our lives without any warrant, without a judge is getting asked. This must stop. As fast as possible."
The last tweet sounded, 4 hours before the meeting with the judge, "The revolution, i say i am, i were, i want to be".
(its not exact quotes because i translated them back into english)
But so much for a revolution if you keep sending people to the jail lols.