Prime Minister Mark Carney's hate crime bill and a controversy surrounding a Northern Irish rap group have focused Canadian attention on a complex legal question: should displaying certain symbols be a crime? The legislation introduced by Carney's Liberal government last month has drawn mixed reviews. Some have praised it as a measured response to soaring hate crime figures, but critics have raised alarm over a provision that, in its words, would "make it a crime to wilfully promote hatred against an identifiable group by displaying certain terrorism or hate symbols in public." Such symbols would include those linked to Canada's...