I agree. Of course, including the context would make a number of the visualizations make sense, which would defeat the purpose of the site. Of course, visualizations that make sense with no context are the sort I guess the creator of this site likes. Someday, we'll all get our news in nice graphics, without all that bothersome reading and thinking that goes along with context.
I really want to know the context of some of these, like the social media 'chart': http://wtfviz.net/image/59427832631