It's probably because they think his [as personally told] story could/will happen to them. A hacker in a dorm room turns out to ignite the planet and become a [paper] billionaire nearly overnight. It's a great story and would be inspiring if true, but like many great stories it's full of shit. He apparently screwed over nearly everyone he came in contact with to get on top.
Whatever bad Zuckerberg has done, it doesn't seem especially plausible that Ceglia made a contribution significant enough to merit a percentage of Facebook.
At the same time, if the contract is authentic, it seems like there's a big back-story here you'd have to learn before making any judgments here.
And, hey, I'll admit I'm really curious what that story is.
As far as justice goes, I don't have any sympathy for someone who continually stole other people's efforts and took all the money/glory/power. I doubt he'll lose it all, but I wouldn't consider that unfair.
Regardless of what happens, it should prove interesting.
