Open this photo in gallery: People attend a candlelight vigil at Lafayette Square across from the White House in Washington for the two Israeli Embassy workers who were shot outside the Capital Jewish Museum.MANDEL NGAN/AFP/Getty Images What we have witnessed in Canada and other Western democracies over the last year and a half is the rapid establishment of social licence. Social licence for the type of violent extremism that resulted in the assassination of two Israeli embassy diplomats, Yaron Lischinsky and Sarah Milgrim, in Washington D.C. last week. Social licence for the open celebration and justification of the murders –...