9/11 the greatest tragedy? I can think of much worse - though it could be argued if it weren't for 9/11 the world wouldn't be in the state it is in now.

I don't think that his claim was entirely sincere.

As others have stated, there was a heavy dose of sarcasm to my comment; I felt that HN would be the sort of place where "/s" weren't necessary but I guess not.

I think that it may have been sarcastic.