I had heard about this video but I never actually saw it until you posted that link.  Apparently someone had died IRL so they had an in-game funeral for the person, which Serenity Now saw as an oppurtunity to gank lots of people.  

I couldn't ready any of the text either, the video quality was apparently downgraded to make the file size smaller.

Notice it was an Alliance guild?  I've noticed a large maturity gap between the average Alliance player and the average Horde player.  It seems the worst griefers and whiners are always on the "good" side while Horde players seem to be more mature.  In general anyway.  There are of course numerous exceptions on both sides.

That video makes me want to make a horde character on Illidan just to gank SN members.