OTTAWA — Prime Minister Mark Carney missed a huge opportunity in Saudi Arabia last week to advocate for human rights, said the son of a Saudi dissident unable to leave the country to join his family in Canada. Carney would not reveal if he raised the case of Raif Badawi in his meetings, adding that “one of the advantages of private meetings is that they remain confidential.” He acknowledged that this particular case is “very difficult” for the man and his family in Canada (he did not mention Badawi by name) and said “this is one an example of a case where, as time goes by, we can try...