== Manchester United F.C. == 

 Good question.  Why is the article such a vandalism target?  Well, plain and simply, it's because ManU sucks!  BOO YA!  Enjoying your debt this season?  Etc. etc. 

 Okay, not really.  It's just a general thing – sports teams attract that sort of immaturity.  For a while there just keeping Sunderland A.F.C. free of Newcastle United F.C. fans was a devil of a job, for example.  Meanwhile, ManU are so popular and well-known that it attracts even those vandals who've never even seen a football match.