Some of those people are obviously weirdo's, infact I'd go so far as to say a majority of the ones in the pictures are, but that doesn't mean all those war protesters were. Another viewpoint of the original picture could be, "I loved NY, but after 9/11 I love them even more for all the pain they went through" Obviously that wouldn't be as contraversial.
Of course I like to give people the benefit of the doubt and I realize most of you probably already knew that's what they could have meant.