The UK prime minister is facing criticism after he celebrated the return to Britain of a human-rights activist who was recently released from an Egyptian prison but whose past social media posts apparently contained violent and antisemitic language. Successive British governments have campaigned for the release of Alaa Abdel-Fattah, a dual national who had been imprisoned in Egypt for most of the past 14 years. He returned to the UK on Friday after Egyptian authorities lifted a travel ban that...