Anonymous is good.  I'd rather see someone express themselves electronically, on a blog, than in the real world with sticks and stones.  
   Whether or not comments on a blog release pent up behavior or if they fuel it, is for psychologists to decide.
   There are times that going against public opinion can be expensive.  Anonymous provides an affordable alternative.  If I want to comment on an issue I don't want a troll showing up on my doorstep and interrupting my dinner  (fortunately that doesn't seem to happen very often).  More importantly I want to be part of the public discussion but I don't want to be marked by institutions.
   Anonymous may also be able to provide a 'canary in the coal mine' effect.  Coverage of some of these gruesome events we've read about, in the media the last few years, has told about comments made on a blog or social media by the individual.  Could an astute reader glean a feel for a geographical area.  There may be ways to direct security budgets if social media can be gleaned.  If an event occurs, and comments are made on local blogs, should we be extra cautious.
   Anonymous is really fiction anymore, anyway.  We may loose this valuable tool once the NSA opens up its Hub to local institutions, law enforcement and media.  Remaining anonymous is beyond the technical expertise of most us, if we want to use any online services. 
   The most fascinating trend in newspapers, during this wave of the information age, has been the comments.  Opinions stretch and expand the discussion are a valuable resource to many if not most readers.