Since we're talking so much about Chomsky lately some may be interested to see his comments on the execution of OBL and Hitchens reaction to those comments.
Hitchens tried to generate a spat with Chomsky before and I think Chomsky's reaction was right. He offered a minimalist reply and then just dropped it. Because what you are dealing with in Hitchens is a guy that doesn't want to deal with Chomsky's arguments as stated. It's straw man and outrage. That's a waste of time. If your critic won't read what you write and respond to your position as stated why would he read your attempt to correct the misread?
Hitchens first tries to associate Chomsky with 9-11 conspiracy theorists, which is something Chomsky expressly rejects. Hitchens pretends Chomsky thinks it's no more likely that bin Laden is responsible for 9-11 than it is that Chomsky won the Boston Marathon. That's just not what Chomsky is saying. He's using the claim about the Boston Marathon to illustrate that we must be cautious about people taking credit in some cases because of the desire to boast. He makes the same point in this contentions and fun interview (point regarding boasting starts at 1:38). I think I've heard Chomsky say that he does believe bin Laden was responsible. In other words that would be a good guess. But we should do better than a good guess. It really is possible he is not responsible, like he claimed in the immediate aftermath of the event.
Chomsky claims there's little evidence of bin Laden's guilt. Hitchens says there is and offers sources. I'm unaware of any substantial evidence. Maybe it's buried in one of the book Hitchens refers to.