Mark Osler: Mall of America protest: A large assembly, a prosecutorial error

 Bloomington’s city attorney didn’t have to press charges. She had discretion. The scene at the Mall of America on Dec. 20. Bloomington authorities said last week that 10 members of the group had been formally charged.   Photo: Aaron Lavinsky • Star Tribune  Star Tribune photo galleries By MARK OSLER  OpEd  January 16, 2015 Just before More