Open this photo in gallery:Toronto Mayor Olivia Chow at a press conference last week.Arlyn McAdorey/ReutersSave for laterThere is a moment when tragedy starts to turn to dark farce in a mass shooting in the United States, that moment when a politician utters the phrase “Thoughts and prayers.”Saying that phrase evokes ersatz empathy, but obviates the need to ask any difficult questions. Questions such as, why did this this shooting happen? What could have been done to prevent it? And what action can government take to help to head off the next attack?“Thoughts and prayers” is all that needs to be...