The point is the cultural pressure that women have to conform to regressive cultural practices under the guise of modesty and piety. One girl was willing to risk violence against her to disobey her parents, just think of all the girls who go along to get along. The idea of modesty is fundamentally incompatible with gender equality as it puts different pressures on women while men are free to do as they please. It has nothing to do with cultural relativism - Canada is an advanced civilized society, countries that demand women cover up under threat of violence or worse are uncivilized and regressive.